CBSE Class 6

In this page, we are providing Getting to Know Plants Class 6 Extra Questions and Answers Science Chapter 7 pdf download. NCERT Extra Questions for Class 6 Science Chapter 7 Getting to Know Plants with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 7 Extra Questions and Answers Getting to Know Plants

Extra Questions for Class 6 Science Chapter 7 Getting to Know Plants with Answers Solutions

Getting to Know Plants Class 6 Extra Questions Very Short Answer Type

Question 1.
What are the plants having green tender stems called?
Answer:
Herbs

Question 2.
What type of root wheat plant have?
Answer:
Fibrous root

Question 3.
Name one plant which has reticulate venation?
Answer:
Marigold

Question 4.
Name the part of plant which produces food.
Answer:
Leaves

Question 5.
Name the part of a flower which becomes fruit after fertilization.
Answer:
Ovary

Question 6.
Name two types of roots found in plants.
Answer:

• Taproot
• Fibrous root

Question 7.
Name the process by which plant make their food.
Answer:
Photosynthesis

Question 8.
Name the green pigment present in the leaves of a plant.
Answer:
Chlorophyll

Question 9.
Name the parts of plant which grows under the ground.
Answer:
Root grows under the ground.

Question 10.
Name a plant which has weak stem.
Answer:
Climbers

Question 11.
Name the three types of plants.
Answer:
Herbs, shrubs and trees.

Question 12.
Which part of plant holds it upright?
Answer:
Stem

Question 13.
Name the tiny pores on the surface of a leaf.
Answer:
Stomata

Question 14.
What is the function of chlorophyll?
Answer:
Chlorophyll imparts green colour to the leaves.

Question 15.
Give one function of stem
Answer:
Stem helps in transportation of water and food in the plants.

Question 16.
Name some plants having taproot.
Answer:
Mango tree, turnip, carrot, beet, etc.

Question 17.
Give some examples of plants having fibrous roots.
Answer:
Millet, bamboo, sugar cane, sweet potato, etc.

Question 18.
What kind of stem do shrub have?
Answer:
Hard but not very thick.

Question 19.
What is the life span of shrubs?
Answer:
Many years but it is less than that of trees.

Question 20.
What kind of stem do herbs have?
Answer:
Soft and delicate stem.

Getting to Know Plants Class 6 Extra Questions Short Answer Type

Question 1.
What are herbs?
Answer:
Herbs are small plants having a soft and delicate stem.

Question 2.
What are shrubs?
Answer:
Shrubs are medium-sized plants with a hard and woody stem branching out near the base. Though stem of a shrub is hard but it is not very thick.

Question 3.
What is pistil?
Answer:
The pistil is the female part of a flower. It is also known as carpel.

Question 4.
Define taproot.
Answer:
A taproot is a straight tapering root which grows vertically down into the soil and gives out branches on all the sides.

Question 5.
What is root?
Answer:
Root is a part of a plant which is below the ground (in the soil). There are two types of roots:

• Taproot
• Fibrous root.

Question 6.
What are plants?
Answer:
Plants are living things. Each plant has many parts to perform different functions for its survival. The main parts of plant are root, stem, branches, leaves, flowers and fruits.

Question 7.
What are fibrous roots?
Answer:
Some plants do not have main root. They have a bunch of similar roots called fibrous roots.

Question 8.
Name the different parts of flowers.
Answer:
A flower consists of following parts:

1. Pedicel
2. Sepals
3. Petals
4. Stamens
5. Carpel

Question 9.
Define pollination.
Answer:
Transfer of pollen grains from anther to stigma of a flower is known as pollination.

Question 10.
What is a tree?
Answer:
Trees are tall and big plants with a hard and thick woody stem.

Question 11.
What are creepers?
Answer:
A plant having thin, long, and weak stem which cannot stand upright and spreads in the ground are known as creepers.

Question 12.
What are climbers?
Answer:
A plant having thin, long and weak stem which cannot stand upright, but readily climbs up neighboring support or a tree is called climber.

Question 13.
What is the main difference between climbers and creepers?
Answer:
The main difference between climbers and creepers is that the climber plants have climbing organs like tendrils but the creeper plants have no such climbing organs.

Question 14.
What is a flower?
Answer:
Flowers are the most beautiful part of a plant. Different plants have different types of flowers. Flowers are of many sizes, shapes and colours.

Question 15.
Define parallel venation.
Answer:
The type of venation in which the veins in a leaf run parallel to one another on both sides of the midrib is called parallel venation. For example, paddy, maize, millet, etc.

Getting to Know Plants Class 6 Extra Questions Long Answer Type

Question 1.
What is root? List the main functions of root.
Answer:
Root is that part of a plant which is below the ground (in the soil). The main functions of roots are as follows:

1. Root absorb water and nutrients from the soil which are needed by plant leaves to make food.
2. Roots help in holding the soil together and thus prevents soil erosion.
3. Roots help the plant to stand erect. This prevents the plant from being pulled out easily or blown away by the wind.
4. Some plants have modified roots which store food for the plants like beetroot, radish, carrot.

Question 2.
What are the functions of flower?
Answer:

1. A flower is the seat or organ of sexual reproduction and results in the formation of fruits and seeds. Seeds on germination give rise to new plants. A flower thus, results in multiplication of plants.
2. It is the source of food for many insects.
3. Flowering plants are grown in gardens and in homes because of the bright colour and fragrance of the flowers. Therefore, they beautify the surroundings and provide aesthetic value.

Question 3.
Explain the process of preparation of food in leaves.
Answer:
Leaves are the food factories of the plant. They make food for the plant by the process of photosynthesis. In photosynthesis, the green leaves of a plant combine carbon dioxide and water in the presence of sunlight and chlorophyll. This can be written as:
image 1

Question 4.
What are herbs, shrubs and trees? Give two examples of each.
Answer:

1. Herbs: Herbs are small plants having a soft and delicate stem. Herbs do not have woody stem. They are non-woody plants. Herbs have a green and tender stem. They are short sized plants. Herbs have short life span. For example, tomato, cabbage.
2. Shrubs: Shrubs are medium-sized plants with a hard and woody, branching out near the base. Shrubs tend to branch near ground level, so many branches are seen rising just above the ground giving them a bushy appearance. For example, lemon, tulsi, etc.
3. Trees: Trees are tall and big plants with hard and thick woody stem. The trees have one main stem called trunk which usually gives out branches and leaves. For example, neem, mango, etc.

Question 5.
What is stem of a plant? State the various functions of the stem in a plant.
Answer:Stem is the part of plant which rises vertically up from the ground. The main functions of the stem of a plant are as follows:

1. The stem holds the plants upright.
2. The stem of a plant carries water and minerals from the roots to the leaves and other parts of the plants.
3. The stem carries the prepared food from the leaves to other parts of the plant.
4. The stem holds the leaves in such a way that the leaves are able to get plenty of sunlight for preparing food by photosynthesis.

Question 6.
What is leaf? What are its functions?
Answer:
The leaf is a thin, broad, flat and green part of a plant which is attached to the stem (or branch). The leaves of plants have three main functions:

1. The leaves make food for the plant by photosynthesis.
2. The leaves get rid of excess water from the plant through transpiration.
3. The leaves carry out the process of respiration in plants.

Question 7.
Draw a labelled diagram of a flower.
Answer:
The main parts of a flower are sepals, petals, stamen and pistil.

Question 8.
What is a fruit?
Answer:
A fruit is that part of a plant that contains the seeds. Apples, oranges, plums, etc., are the example of fruits. The fruits and seeds are formed from flowers by the process of pollination and fertilization.

Question 9.
Differentiate between herbs and shrubs.
Answer:

Question 10.
Differentiate between taproot and fibrous root.
Answer:

Getting to Know Plants Class 6 Extra Questions HOTS

Question 1.
Write the location of the following:
(i) Ovule
(ii) Pollen grains
(iii) Endosperm
Answer:
(i) Ovary
(ii) Anther
(iii) Seed

Question 2.
Write the name of plant parts which perform the following functions:
(i) Anchoring
(ii) Transportation
(iii) Preparing food
(iv) Reproduction
(v) Germination
Answer:
(i) Root
(ii) Stem
(iii) Leaves
(iv) Flower
(v) Seed

Question 3.
Which part of the flower is necessary for reproduction? Why?
Answer:
Stamen and pistil are necessary for reproduction as they produce male gamete and female gamete respectively. Petals helps in attracting insects for pollination as they are variously coloured whereas sepals protect the flower buds. Both petals and sepals are accessory parts of the flower.

Question 4.
What is the function of seed coat?
Answer:
Seed is surrounded by a tough covering called seed coat. It protects the seed from outer harsh environment.

Question 5.
What is the main difference between climbers and creepers?
Answer:
Climbers need support whereas creepers can grow along the ground. Climbers have tendrils for climbing but creepers do not have this structure.

Getting to Know Plants Class 6 Extra Questions Value Based Question (VBQs)

Question 1.
Rima kept some soaked gram seeds for sprouting. But she forgot about this. On fifth day she suddenly remembered and opened the container having seeds. She found that small leaves along with white sprouts have grown out of the seed.
(a) What does the white structure of sprout give rise to?
(b) What kind of root is found in gram plant?
(c) Why Rima found small leaves in the sprouts?
(d) What value of Rima is shown here?
Answer:
(a) White structure of the sprout give rise to root of the plant.
(b) Taproot.
(c) Rima kept the soaked gram seeds for many days so they germinated into young plants.
(d) Rima is careless, forgetful but at the same time she is a good observer.

Question 2.
Rakesh while walking in his terrace garden found many types of wasp wandering around the flowers. He thought that these insects are spoiling his flower and immediately took out the insect collecting net to get rid of them. On seeing this Rakesh’s elder brother stopped him from doing this and said that these wasps are flower’s friends.
(a) What do these wasps get from the flowers?
(b) Why Rakesh’s elder brother call these wasps as ‘flower’s friend’?
(c) What is pollination?
(d) What value of Rahul’s elder brother is shown here?
Answer:
(a) Wasps get pollen and nectar from the flowers.
(b) Wasps help in transfer of pollen grains from anther to stigma. Thus, it helps in pollination.
(c) Pollination is the transfer of pollen grains from anther to stigma of a flower.
(d) Rahul’s elder brother is eco-friendly, intelligent, empathy and helpful.

Question 3.
After learning about types of roots Amrita was too curious to see types of roots in different plants. She started uprooting plants from the garden. Shweta, her friend and classmate, on seeing this stopped her and told her that one can determine the kind of root by just seeing the leaves. We need not require to uproot the plants.
(a) What are the two types of roots?
(b) How leaves can determine the type of roots?
(c) What value of Shweta is shown here?
Answer:
(a) Two types of roots are taproot and fibrous root.
(b) The design made by veins in a leaf is called the leaf venation. The pattern of leaf venation determines the type of roots present in a plant. If the leaf have reticulate venation then it has taproot and if the leaf have parallel venation then it has fibrous root.
(c) Shweta is intelligent, eco-friendly and have scientific aptitude.

In this page, we are providing Changes Around Us Class 6 Extra Questions and Answers Science Chapter 6 pdf download. NCERT Extra Questions for Class 6 Science Chapter 6 Changes Around Us with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 6 Extra Questions and Answers Changes Around Us

Extra Questions for Class 6 Science Chapter 6 Changes Around Us with Answers Solutions

Changes Around Us Class 6 Extra Questions Very Short Answer Type

Question 1.
Give two examples of irreversible changes:
Answer:
(a) Milk to cheese
(b) Cooking of food.

Question 2.
Give two examples of slow changes:
Answer:
(i) Growing of plants
(ii) Ripening of fruits

Question 3.
Can you change the shape of a eraser after erasing?
Answer:
Yes

Question 4.
Give one example of change in size.
Answer:
Stretching of a spring.

Question 5.
What changes the direction of a body?
Answer:
Force

Question 6.
Are all changes reversible?
Answer:
No

Question 7.
What kind of change is breaking of wood-reversible or irreversible?
Answer:
Irreversible

Question 8.
Give an example of reversible change.
Answer:
Melting is an example of reversible change.

Question 9.
Growing of nails is an example of which type of change?
Answer:
Slow change

Question 10.
Name the process in which solid directly changes into vapour.
Answer:
Sublimation.

Question 11.
Water turns into which state when it becomes ice?
Answer:
Solid state

Question 12.
Give an example of natural change.
Answer:
Growth of a baby.

Question 13.
Rusting of an iron is which type of change?
Answer:
Irreversible change

Question 14.
When ice changes into water, which type of change occurs in it?
Answer:
Change of state

Question 15.
Give an example of physical change.
Answer:
Cooling of molten wax.

Question 16.
Give an example of chemical change.
Answer:
Burning of wax.

Changes Around Us Class 6 Extra Questions Short Answer Type

Question 1.
What is change?
Answer:
An alteration in the physical or chemical properties of a matter due to effect of some kind of energy is called change.

Question 2.
What are the different forms of changes noticed?
Answer:
The various type of changes noticed are:

1. Change in shape
2. Change in size
3. Change in colour
4. Change in state
5. Change in direction

Question 3.
Define reversible change.
Answer:
The changes in which it is possible to get back to the original product again is called reversible change.

Question 4.
State the list of changes caused due to heating.
Answer:
The changes caused due to heating are:

• Expansion
• Change in state
• Combustion

Question 5.
What is chemical change?
Answer:
The result which leads to the formation of new substance is called chemical change.

Question 6.
What do you mean by combustion?
Answer:
The property of a substance by which substance start burning on heating is called combustion.

Question 7.
Define evaporation.
Answer:
The process of conversion of liquids into its vapour state by heating is called evaporation.

Question 8.
What do you mean by expansion?
Answer:
Solids, liquids and gases occupy more space when they are heated. This is called expansion.

Question 9.
Define fast changes with two examples.
Answer:
The type of change which takes short time to complete is known as fast change. e.g.,
(i) Burning of forest.
(ii) Striking of a matchstick.

Question 10.
List the characteristics of physical change.
Answer:
Following are the characteristics of physical change:

1. No new substances are formed.
2. Properties of a substance doesn’t change.
3. These changes are reversible.

Question 11.
List the characteristics of chemical change.
Answer:
Following are the characteristics of chemical change:

1. Properties of products are different from reactants.
2. Most of the chemical changes are irreversible.
3. Loss or gain of energy occurs in a chemical change.

Question 12.
Define melting.
Answer:
The process by which solid substances melt and turn into liquid is known as melting.

Question 13.
Define contraction.
Answer:
It is the phenomenon in which a substance shrinks or changes its shape.

Question 14.
Why the stretching of a rubber band is reversible change?
Answer:
The stretching of a rubber band is a reversible change because after we leave the rubber, it gets back to its original position automatically.

Question 15.
Why the burning of paper is an irreversible change?
Answer:
Burning of paper is an irreversible change because after burning, the paper, it is not possible to get back the same paper which was burnt.

Changes Around Us Class 6 Extra Questions Long Answer Type

Question 1.
Distinguish between reversible and irreversible changes.
Answer:

Question 2.
Define physical and chemical changes. Give examples.
Answer:
(i) Physical change: Physical change is a temporary change in which chemical composition of the substance does not change and no new substance is formed. During a physical change, only the physical properties of a substance change. It is reversible change.

For example, the water changes from solid form to liquid form. It can be solidified again. The properties of water remains same in both the cases.

(ii) Chemical change: A chemical change is a permanent change in which not only the physical properties but chemical properties also changes. It is an irreversible change. For example formation of curd from milk, rusting of iron, etc.

Question 3.
Most physical changes are reversible. Give reasons with two examples.
Answer:
(i) Melting of ice: During this change, the water changes from its solid form to liquid form. It can be solidified again. The properties of water remains same in both cases hence it is a reversible change.
(ii) Glowing of an electric bulb: During this change, electricity is passed through the tungsten filament returns to its original shape and condition, hence totally reversible.

Question 4.
How does curd being set? Is this change reversible?
Answer:
A small quantity of curd is added to warm milk. The milk is stirred and is set aside undisturbed for a few hours at a warm place. In a few hours the milk changes into curd. Taste and texture of curd is different from milk. Curd formed from milk cannot be changed into milk again. So this is an irreversible change.

Question 5.
Give some examples from daily life where expansion of metal by heating is used. Explain.
Answer:
Fixing of a metal rim on wooden wheel and fixing of wooden handles in iron blade in agricultural tools are such examples.

The iron blade of these tools has a ring in which the wooden handle is fixed. Normally the ring is slightly smaller in size than the wooden handle. To fix the handle, the ring is heated and it becomes slightly larger in size (expands). Now, the handle easily fits into the ring. When the ring cools down, it contracts and fits tightly on to the handle.

Question 6.
Explain why the burning of paper is said to be an irreversible change whereas the boiling of water is known as reversible change.
Answer:
If we burn a piece of paper, it changes into ash and smoke. Now, we cannot combine the ash and smoke to form the original piece of paper. So, the burning of paper, is a change which cannot be, reversed. Hence the burning of paper is an irreversible change.

When we boil water by heating then it changes into steam. Now, if we cools the steam, then water is formed again. So changing of water into steam has been reversed by cooling. Thus, the boiling of water is reversible change.

Question 7.
When is a change said to have taken place in a material? Explain with an example.
Answer:
We have many things around us. All these things have certain properties such as state (liquid, solid, gas), position, shape, size, colour, temperature, composition, and structure, etc. When one or more properties of a thing become different, we say that it has changed or a change has taken place, changes involve different kind of alterations in the things around us.

When a change takes place, there may be a change in the state, position, colour, temperature, composition or structure of the material of the object. When an ice melts, it forms water. Ice is a solid whereas water is a liquid. So, the melting of ice involves a change in state (from solid to liquid state).

Question 8.
What is the difference between following changes:
(a) Rolling a roti from dough.
(b) Baking of a roti.
Answer:
(a) We can convert this rolled roti back into the ball of dough. This means that the rolling of roti out of dough is a change which can be reversed and also it is a physical change. So, the rolling out of dough is a reversible and physical change.

(b) Baked roti cannot be changed back into the original ball of dough. So, the baking of a roti is an example of change which cannot be reversed and also it is a chemical change. Thus it is an irreversible and chemical change.

Changes Around Us Class 6 Extra Questions HOTS

Question 1.
Categorise the following changes as reversible or irreversible also as chemical or physical changes.
Burning of candle, rusting of iron, fitting metal rim on cart, setting of POP, cutting of wood, boiling of water, cutting of fabrics, washing rice.
Answer:

Question 2.
Do you find any similarities in above question?
Answer:
Yes, from above answer we can conclude that most of the reversible changes are physical in nature and most of the irreversible changes are chemical in nature.

Question 3.z
List some changes around you which you think are desirable and undesirable to you.
Answer:
(i) Desirable changes: Ripening of fruits, cooking of food, growing of a baby, nice smell of incense stick on burning it.

(ii) Undesirable changes: Rusting of iron, falling of leaves, undesirable smell of rotting vegetables, smell of burning coal.

Changes Around Us Class 6 Extra Questions Value Based Question (VBQs)

Question 1.
Sarita, when entered her house, got a pleasant smell of incense stick burnt by her mother during puja. She went near to the place where incense stick was burning and observed that, the paper kept below it was burned from many places. She immediately suggest her mother to keep the burning incense stick on some metal plate onwards.
(a) What kind of change is burning of incense stick?
(b) Why the paper get burn?
(c) What values of Sarita are shown here?
Answer:
(a) Burning of incense stick is chemical and irreversible change.
(b) The paper got burned due to the falling of hot ashes of incense stick on it.
(c) Sarita is an intelligent, concerned, sensible and having future sight.

Question 2.
There was some construction work in Rahul’s house in the rainy season. A truck filled with cement bags came and labours started unloading the bags on a waterlogged road. Rahul when saw this, immediately stopped the labours and asked them to keep the bags inside the house in a dry place.
(a) What is a chemical change?
(b) What would have happened to the cement bags if kept in waterlogged roads?
(c) What values of Rahul is shown here?
Answer:
(a) A change in which the properties of a substance is changed with evolution or absorption of heat is called a chemical change.
(b) If the cement bags have been kept in waterlogged roads then the cement would have reacted with water to form a substance with other property and evolution of heat. Thus, the cement would have got wasted.
(c) Rahul is an intelligent, having scientific aptitude and economical thinker.

In this page, we are providing Separation of Substances Class 6 Extra Questions and Answers Science Chapter 5 pdf download. NCERT Extra Questions for Class 6 Science Chapter 5 Separation of Substances with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 5 Extra Questions and Answers Separation of Substances

Extra Questions for Class 6 Science Chapter 5 Separation of Substances with Answers Solutions

Separation of Substances Class 6 Extra Questions Very Short Answer Type

Question 1.
What are the components of air?
Answer:
Oxygen, carbon dioxide, nitrogen, etc.

Question 2.
What are the components of milk?
Answer:
Milk-proteins, calcium, cream and water.

Question 3.
What are the types of mixture?
Answer:
Heterogeneous mixtures and homogeneous mixtures.

Question 4.
Name the process used to separate heavier and lighter components of a mixture.
Answer:
Winnowing

Question 5.
Mention one purpose of separating the constituents of a mixture.
Answer:
To remove the undesirable substances.

Question 6.
When handpicking is used?
Answer:
Handpicking is used to separate undesirable components having different shape, size, colour and are present in small amount.

Question 7.
Which type of separation process is used in cashewnut factories?
Answer:
Sieving

Question 8.
Name the process used to obtain salt from sea water.
Answer:
Evaporation

Question 9.
Write opposite of the process of condensation.
Answer:
Evaporation

Question 10.
What is effect of temperature on solubility?
Answer:
Solubility increases when temperature increases.

Question 11.
Name the process of obtaining clear water from muddy water in which alum is used.
Answer:
Loading

Question 12.
Which method is used to separate a mixture of tea leaves and iron filings?
Answer:
By magnet

Question 13.
Which gas dissolved in water helps aquatic animals to breathe?
Answer:
Oxygen gas

Question 14.
Name the method by which you can separate butter from milk.
Answer:
Centrifugation

Question 15.
Which liquid is called as universal solvent?
Answer:
Water

Question 16.
Name some materials that are used as filters.
Answer:
Cotton, ceramic, fine cloth, filter paper, etc.

Question 17.
Give one example of sieving used in everyday life.
Answer:
Separation of bran from flour.

Question 18.
Which substance is used for loading?
Answer
Alum

Question 19.
Which process is used to separate bacteria from water?
Answer:
Filtration by using bacteria proof filters.

Question 20.
Name the process of separating two immiscible liquids.
Answer:
Decantation

Separation of Substances Class 6 Extra Questions Short Answer Type

Question 1.
Why mixtures need to be separated?
Answer:
The main reason for separating the mixtures are:

1. To remove undesirable substances.
2. To get desirable substances.
3. To obtain highly pure substances.

Question 2.
What is handpicking? When this method is used?
Answer:
The method in which the constituents are separated by simply picking them up by hand is called hand-picking. It is used when there is a difference in size, colour, shape of desirable and undesirable constituents.

Question 3.
What is evaporation? What is the significance of this process?
Answer:
The changing of liquid into vapours is called evaporation. The process of evaporation is used on a large scale to obtain common salt from sea water.

Question 4.
What is threshing?
Answer:
The process of separating grains from the stalks is called threshing.

Question 5.
What is the use of decantation?
Answer:
Decantation is used to separate insoluble solids from liquids. Two immiscible liquids are also separated by this process.

Question 6.
What is a mixture?
Answer:
When two or more than two substances are mixed together in any ratio then it is called a mixture.

Question 7.
What is decantation?
Answer:
Decantation is the process of separating insoluble solids from liquids. A suspension of solid particles in liquid is allowed to stand for some time. Solid particles settle down at the bottom. The clear water is then transferred into another beaker.

Question 8.
State one use of the method of winnowing.
Answer:
The method of winnowing is used to separate husk from various types of grain like wheat, rice, etc. Give one use of the handpicking method of separating mixtures in daily life. The method of handpicking is usually used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses.

Question 9.
Define the term sedimentation.
Answer:
The process in which heavier, insoluble solid settles down in a solution is called sedimentation.

Separation of Substances Class 6 Extra Questions Long Answer Type

Question 1.
Elaborate the process of filtration.
Answer:
Filtration is the process of separating an insoluble solid from a liquid with the help of a filtering agent like filter paper, cloth, strainer, etc. During filtration, the solid insoluble substance is retained at the filter paper as residue while the liquid free from any suspended matter passes through the filter paper and is collected as filtrate.

There are certain soluble components infiltrate which can be separated by the process of evaporation followed by crystallization.

Question 2.
What is meant by saturated and unsaturated solution?
Answer:

• Saturated solution: At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving, is said to be a saturated solution.
• Unsaturated solution: A solution in which more quantity of solute can be dissolved without raising the temperature of the solution is called unsaturated solution.

Question 3.
What is the effect of temperature on a saturated solution?
Answer:
(i) When a saturated solution is heated to a higher temperature, then it becomes unsaturated because the solubility of solute increases with increase in temperature of the solution.
(ii) When a saturated solution is cooled to a lower temperature, then some of the dissolved solute separates out in the form of solid crystal because the solubility of solute decreases on cooling the solution.

Question 4.
What is the importance of centrifugation? How it is done?
Answer:
Centrifugation is the process of separating suspended particles from a liquid by rotating the liquid at a high speed.

The mixture is taken in a closed bottle and rotated at a high speed. The heavy particles settle at the bottom while light particles remains behind. The method is also used to separate cream from milk. Cream being lighter than milk, floats at the top of the mixture.

Question 5.
What is loading? How will you obtain clear water from muddy river water by the process of loading?
Answer:
The suspended small particles of muddy water are negatively charge which inhibit them to settle down due to repulsion. On adding alum to this muddy water, removes the negative charge from the particles. This particles forms clump easily, become heavier and settles down.

This process is called loading. Loading helps in purification of water from small suspended particles which do not settles down easily and quickly. The clear water after settling down of suspended particles is decanted in another container and is comparatively clearer.

Separation of Substances Class 6 Extra Questions HOTS

Question 1.
Rahul by mistake mixed sugar with salt. What method he must adopt to quickly separate this mixture?
Answer:
He must use the method of sieving for separating salt and sugar.

Question 2.
Can we separate the mixture of sugar and milk?
Answer:
No

Question 3.
Which method of separation will you adopt to separate a mixture of wheat flour, moong dal and chana?
Answer:
We will adopt the method of sieving followed by handpicking to separate the mixture. Sieving will separate wheat flour from moong dal and chana. Handpicking will separate moong dal from chana. Sieve with appropriate pores can also be used to separate moong dal from chana.

Question 4.
Suggest any two methods to separate suspended particles of mud from water.
Answer:
Loading with alum and centrifugation.

Question 5.
Is there any method through which we can separate different components of ink?
Answer:
Chromatography technique.

Separation of Substances Class 6 Extra Questions Value Based Question (VBQs)

Question 1.
Some shopkeepers mix many cheap and harmful substances in the food materials. This process is called adulteration. Anybody who are involved in such kind of illegal practices are liable for imprisonment.
(a) Why shopkeepers mix cheap and harmful substances in food materials?
(b) How will you separate impurities from grains and pulses?
(c) What values of shopkeepers are shown here?
Answer:
(a) Shopkeepers add these undesirable substances to increase the quantity of the food materials and thus their profit.
(b) Through handpicking.
(c) Shopkeepers observing such practices are greedy, self-centred, criminal-minded and soulless.

Question 2.
There were guests at Sonam’s house. Sonam thought of making lemonade for them. She dissolved sugar in chilled water and observe that sugar was taking long time to dissolve. Meanwhile, Sonam’s mother came and asked her to transfer the upper chilled water in another container and then add water at normal temperature to this sugar settled at bottom.
Sonam then found it easy to dissolve the sugar for lemonade.
(a) What is saturated solution?
(b) What is the effect of temperature on the capacity of water in dissolving substances?
(c) What will happen if we cool a supersaturated solution?
(d) What value of Sonam is shown here?
Answer:
(a) A saturated solution is the solution which cannot dissolve any more solute in it at a given temperature.
(b) With increase in temperature solubility of a substance increases in water and vice versa.
(c) When a supersaturated solution is cooled, it form crystals of the salt. This process is known as crystallization.
(d) Sonam is a good host, learner, helpful girl.

Letter writing is an essential skill. Despite the prevalence of emails and text messages, everyone has to write letters at some point. Letters of complaint, job applications, thank you letters, letters requesting changes or – making suggestions – the list goes on and on. Encouraging children to write letters from an early age will improve their communication, social and handwriting skills, and teach them what they need to know about writing and structuring letters.

Children are expected to learn how to write letters, notes and messages. They have to be aware of different styles of writing, the use of formal and informal letters, and to select style and vocabulary appropriate to the intended reader.

This grammar section explains English Grammar in a clear and simple way. There are example sentences to show how the language is used. You can also visit the most accurate and elaborate NCERT Solutions for Class 6 English. Every question of the textbook has been answered here.

Informal Letter Writing Topics for Class 6 CBSE Format, Samples Pdf

There are two types of letter

• Informal letters
  
• Formal letters

Informal letters
These are letters to friends and relations, or people you know well.

• Casual and light-hearted tone.
• Lengthier than a formal letter.
• Preferably I side of the page.

Structure:

• The sender’s address should always appear on the top right-hand corner of the page.
• Include telephone number and email if available
• Greeting – There are several variations that can be used depending on how well you know the person: Dear Mary, Hi Mary, Greetings,
• Complimentary close – short comment, for example, Love, Lots of love, With thanks, See you soon

Layout for an Informal letter

Informal Letter Writing Topics Solved Examples for Class 6 CBSE

Informal Letters (Personal)

Question 1.
Write a letter to your sister congratulating her on success in the examination
Answer:
Examination hall,
Ahmedabad
July 05, 20XX,

My Dear Sister,
I am very happy to know that you have passed the secondary school certificate (S.S.C) examination with credit. You got the first division in the examination. I congratulate you on your brilliant success. I am sending you the gift of a wrist watch. May you succeed in every sphere of life. With best wishes,

Yours affectionately
xyz

Question 2.
Write a letter to your mother about the test you have just taken.
Answer:
Examination hall,
Surat
January 03, 20XX,

My Dear Mother
How are you? By the grace of god, I am quite fine. I am sorry that I could not write you earlier. I was taking the second terms papers which ended yesterday. I did well in all the papers. I hope to get 90% marks. I also hope I will stand first in my class. It is possible if you pray for me.

Thank you.

Pay my regards to all at home.

Your loving
son
Raj

Question 3.
Write a letter to your father requesting him to send you some extra funds for payment of hostel dues.
Answer:
Examination hall,
Jaipur
March 11, 20XX,

My Dear Father,
I hope this letter of mine will find you in the best of your health. You will be happy to know that I stood first in my class getting 765 marks. I had to buy some helping books to my course and stationery. They have emptied my pocket. I have run short of money. I shall be grateful to you if you send me extra 1000 rupees for the payment of hostel dues. Pay my regards to all at home. Your loving son, Monish.

Question 4.
Write a letter to your friend thanking him for birthday present he sent for you.
Answer:
House no. 75
Bahubali enclave
Agra
April 14, 20XX

Dear Raghav,
I received your letter yesterday. I am glad to know that you are well. I have just received gift. Thank you very much for your birthday present. The wrist-watch you have sent is splendid. It is very kind of you to give me such a fine present. Hope you are well.

My best regards to your parents.

Yours ever
Hema

Question 5.
Write a letter to your father asking from money to pay the school fee and to buy new books.
Answer:
Flat no. 47
Laxmi nagar
New Delhi
April 14, 20XX

Dear Father,
I received your letter yesterday. I am glad to know that you are well. I need to buy some new books. I could pay my school fees for the last month. So I need rupees 1000. I shall be glad if you send me the said money. With best regards for you and mother.

Yours loving son
Sanjay

Question 6.
Write a letter to your friend inviting him to a picnic at city lake, Udaipur.
Answer:
209, Gandhi nagar
Udaipur
April 14, 20XX

Dear Rohit,
I received your letter yesterday. I am glad to know that you are well. You will be glad to hear that we are going to city lake on February 6 for a picnic. I invite you to join us. Our friends Jony and Rony also will go to city lake with us. City lake is a beautiful place. We shall boat in the Bay together. We shall eat, drink and enjoy together. I am waiting for you.

Yours loving son
Rohan

Question 7.
Write a letter to your friend telling him how you have spent the summer vacation.
Answer:
557, Vivek Vihar
New Delhi
April 14, 20XX

Dear Rajeev,
I have received your letter. You have wanted to know about the how, I have spent my last summer vacation. Now I am writing you about it. You know that education is the backbone of a nation. No nation can prosper without education. But it is a matter of sorrow that most of the people of our country are illiterate and ignorant. They do not know how to read and write.

They have no knowledge of health, family planning and scientific method of cultivation. So I and some of my friends have decided that we would remove illiteracy and ignorance from our village. Finally we implemented our plan and spent the whole vacation in teaching the illiterate villagers. It was an enlightening experience. Villagers thanked us with their kind gestures.

Yours ever
Sameer

Question 8.
Write a letter to your friend inviting him in a birthday party.
Answer:
78, Seema puri
New Delhi
April 14, 20XX

Dear Tanu,
You will be delighted to know that a birthday party has been arranged on the occasion of my 13th birthday at our residence at 6 pm. Only my cousins and a few friends will join the party. A mušical program has also been arranged. I shall be very glad if you take part in it with your camera. Please don’t forget to come. With best regards to you and your parents and younger.

Yours ever
Palak

Question 9.
Write a letter to your friend describing a picnic.
Answer:
486, Chanakya Puri
New Delhi
April 14, 20XX

Dear Renu,
Thank you for your letter. You wanted to know about the picnic that I enjoyed one week ago. Now I am giving you a short description about it. Only the students of our class and some teachers took part in it. We went to Lodhi garden. The place is very rich in natural scenery. We started our journey at 9 in the morning and reached there within an hour. We had a lot of fun there. We played games and ate plenty of food. We also enjoyed the scenery of nature. I personally enjoyed the bus journey to and from the spot. Really it was a very enjoyable and interesting picnic to me. I shall not forget this picnic. With best wishes and love.

Yours ever
Hema

Question 10.
Your father has sent a beautiful gift on your birthday from London. Write a letter to him expressing your feeling of love and admiration for him. You are Sushmita, living at D–7, Amar colony, Lajpat nagar, New Delhi.
Answer:
D-7, Amar Colony
Lajpat Nagar
New Delhi
15th May 20XX

Dear Father,
I received such a nice gift from you on my birthday. My joy knew no bounds. This book gives me a lot of knowledge of vocabulary. Although a good number of my friends and relatives attended the birthday party, yet I missed you all the time. My friends and relatives gifted me many things but your gift of a dictionary is unique in many aspects. This gift is a great source of joy for me. It will help me to cultivate the habit of reading good books. I shall preserve and treasure it throughout my life.

Yours lovingly
Sushmita

Question 11.
In about 100-125 words, write a letter to your friend congratulating him on his success in the examination.
Answer:
10, Prashant Vihar
New Delhi
2nd August 20XX

Dear Sumit,
Please accept my heartiest congratulations on your brilliant success at the Secondary School Examination Board. To secure a high first division is no mean achievement. Though degrees are not now so highly valued as in the past, even so your grand success commands respect. I am sure you will get into a good job in any line you choose. With regards,

Your friend
Prabhat.

Question 12.
In about 100–125 words, write a letter to your friend, inviting him to spend his holidays with you.
Answer:
41, Dwarka II
New Delhi
21st May 20XX

Dear Kailash,
I am very happy to get your nice letter after a long time. Everyone here had been waiting for news about you. Your college is going to close for Puja holidays. Father and I would like you to spend at least the first week of your holidays with us here. We will have a very nice time here.

Days and nights will not be too cold or too hot. We can play, study and walk together. We can enjoy life in full. We are sure you will be able to come. Mother sends you love. Everyone wishes you good luck at the examination. Please do come here.

With love,

Your friend
Suraj

Question 13.
Your friend has invited you to his birthday party. In about 100-125 words, write a letter to him thanking him for it.
Answer:
F-36, R.K. Puram I
New Delhi
2nd August 20XX

Dear Mona,
Thank you very much for kind invitation to your birthday party. My parents have given me consent to spend my day with you. So, wait for me about half-past ten. I will bring my flute and play for you in the garden. My camera will also be with me. You know I produced such wonderful tunes of my flute that charm all my listeners.

With love Your friend
Sima

Question 14.
Your uncle sent you a book for a birthday present. In about 100-125 words, write a letter to your uncle, thanking him for the gift.
Answer:
213, Sarvapriya Vihar
New Delhi
12th December 20XX

Dear Uncle,
Thank you ever so much for the book you have sent me. It was good of you to remember by birthday. You have sent me such an interesting book to read. I have often heard people talk about Kupfer’s Legends of Greece and Rome. I always liked to read it. Now I have it for my own. I feel very proud of it.

I am glad you did not send me an ordinary school – book, most of which are very dry. I began reading the book soon after I received the parcel. It was so exciting that I could not go bed until I finished it. I shall work hard at my English now so that I can read such books easily. Again thanking you for the nice present and the pleasure it has given me.

Your lovingly
Sneha.

Informal Letter Writing Topics Practice Examples for Class 6 CBSE

Informal Letters (Personal)

• Write a letter to your friend inviting him/her to your birthday party
• Write a letter to your friend thanking him/her for attending your birthday party
• You are Sudeep living in school hostel at Surabhi Street, Yojna Nagar. Write a letter to your mother informing her about your performance in the recently held tests.
• Write a letter to your brother thanking him for a birthday gift. You are living at 15/14, Malviya Nagar, New Delhi.
• You are Shiv living at 18, Preet Vihar, Agra Cantt. Your uncle had an official holiday and invited you to show the Taj Mahal which you always wished to see. Write a letter to your friend telling him about your trip to this historical place.
• Write a letter to your friend inviting him to spend Durga Pooja holidays with you.
• On the basis of the picture given below, write a letter to your friend how you got an opportunity to witness a football match.
• You visited a city hospital to see a sick friend. You were pained at the sight of the hospital ward that was ill – maintained. Write a letter to your friend expressing your feeling with the help of the visual here.

In this page, we are providing Sorting Materials Into Groups Class 6 Extra Questions and Answers Science Chapter 4 pdf download. NCERT Extra Questions for Class 6 Science Chapter 4 Sorting Materials Into Groups with Answers will help to score more marks in your CBSE Board Exams.

Sorting Materials Into Groups Class 6 Extra Questions and Answers Science Chapter 4

Extra Questions for Class 6 Science Chapter 4 Fibre to Fabric with Answers Solutions

Sorting Materials Into Groups Class 6 Extra Questions Short Answer Type

Question 1.
Name a non-metal that has lustre.
Answer:
Diamond

Question 2.
Name the two main groups into which all the objects around us can be classified.
Answer:
Living objects and non-living objects.

Question 3.
Is a substance which can be compressed soft or hard?
Answer:
Soft

Question 4.
Name two objects made from transparent materials.
Answer:
Polythene, glass-container.

Question 5.
What do we call a substance that is used to make an object?
Answer:
Material

Question 6.
Which state of matter has fixed shape and volume?
Answer:
Solid

Question 7.
Name two transparent liquids.
Answer:
Water and alcohol

Question 8.
In a blue-colored solution of a dye and water which is solute and which is solvent?
Answer:
Water is solvent and dye is solute.

Question 9.
Name some substances which are made from plastics.
Answer:
Toys, plates, buckets, cups, pens, etc.

Question 10.
Which is more hard-sponge or iron?
Answer:
Iron is harder than sponge.

Question 11.
Which material is generally used for making pens?
Answer:
Plastic and metal

Question 12.
Name two gases which are insoluble in water.
Answer:
Nitrogen and hydrogen

Question 13.
Name two substances which are made from leather.
Answer:
Belt and purse (wallets)

Question 14.
What is common between salt and sand?
Answer:
Both have mass and are in solid state.

Question 15.
Name two materials which floats on water.
Answer:
Wood and plastics Define density.

Question 16.
Define Density.
Answer:
Density is defined as mass per unit volume of a substance.

Question 17.
Name the materials that can be used for making the handles of cooking utensils.
Answer:
Wood, bakelite and plastics.

Question 18.
Name two materials which are non-conductor of electricity.
Answer:
Wood and rubber

Question 19.
Name two materials without lustre.
Answer:
Cardboard and wood

Question 20.
Name two materials which do not dissolve in water and are lighter than water.
Answer:
Kerosene and mustard oil

Sorting Materials Into Groups Class 6 Extra Questions Short Answer Type

Question 1.
What are the similarities between iron, copper and aluminium?
Answer:
The similarities between iron, copper and aluminium are:
(a) They all have lustre.
(b) They all are metals.
(c) They all are hard.
(d) They all conduct electricity.

Question 2.
Why do we need the grouping of objects?
Answer:
Grouping the objects helps us to arrange them in a systematic manner. The objects when grouped are easy to handle. When grouped it is easy to know the properties of objects clearly. Grouping also makes easy to compare two objects.

Question 3.
Write any four properties of materials.
Answer:
The four properties of materials are:
(a) Appearance
(b) Hardness
(c) Solubility
(d) Transparency

Question 4.
Why is mercury used in making thermometers?
Answer:
Mercury is used in making thermometers because:

1. Mercury is liquid at room temperature.
2. It is a good conductor of heat.
3. Mercury has lustre, so, it is easy to read the temperature shown by the level of mercury.

Question 5.
What are materials? Classify it.
Answer:
A substance which is made up of matter and is used for making objects is called material.
Materials are classified as:
(a) Natural materials
(b) Man-made materials

Question 6.
Explain the types of properties.
Answer:
Properties may be of two types:
(a) Physical properties: Physical properties include appearance, hardness, solubility, flotation, heaviness, transparency, etc.
(b) Chemical properties: Chemical properties include the behavior of a material towards different chemicals and chemical reactions. For example, reaction with oxygen, water, acids, combustion, burning, etc.

Question 7.
Write three common characteristics of materials.
Answer:
The three common characteristics of materials are:
(a) All materials can be felt by one or more of our senses.
(b) All materials occupy space.
(c) All materials have mass.

Question 8.
What is the need for classification?
Answer:
Classification is essential for:

1. Identification of objects
2. Sorting of objects
3. Locating things
4. Understanding similarities and dissimilarities among objects.
5. Making the study of objects easy and more meaningful.

Question 9.
Name the various materials from which following things can be made:
Shoes, chair, coins, utensils, clothes
Answer:

1. Shoes: Leather, rubber, plastic, canvas.
2. Chair: Wood, metal, plastics, concrete.
3. Coins: Copper, silver, gold, aluminium.
4. Utensils: Iron, copper, aluminium, brass.
5. Clothes: Cotton, wool, silk, rayon.

Question 10.
Why is tumbler not made with a piece of cloth?
Answer:
Tumbler is not made with a piece of cloth because we generally use a tumbler to keep a liquid. A tumbler made of a piece of cloth cannot be used to keep water. So, a tumbler is made with a material which has a property to hold the liquid.

Sorting Materials Into Groups Class 6 Extra Questions Long Answer Type

Question 1.
What are the advantages of classification of materials?
Answer:
The advantages of classification of materials are as follows:

1. Classification helps us to understand similarities and dissimilarities among the objects.
2. Classification of objects help us to identify the objects easily.
3. Classification helps us to locate things. It is only because of classification, we are able to locate a book that we need out of thousands in our school library.
4. Classification helps us to know the material of which the object is formed.
5. Classification makes study of different objects easy and more meaningful.
6. Rather than studying each object separately, we can study just one out of each class of different objects and generalize our results for the class as a whole.

Question 2.
“Grouping of objects helps the shopkeeper.” Justify the statement.
Answer:
The grouping of objects in proper way makes it easier to work. When we got to purchase something, the shopkeeper locates it easily, because there are separate shelves to put various items and similar things are kept at one place. If he randomly places all of these, he would never be able to find it so quickly and easily.

Question 3.
Describe a method to prove that water is a transparent material.
Answer:
Take a white sheet of paper, one sketch pen, one clean beaker and a small quantity of clean water. Now on white sheet of paper make a symbol (say ‘X’). Now put the empty beaker over the marked symbol. We can see the marked symbol properly. Now pour water in the beaker and observe the same mark. The mark is again visible. This method proves that water is transparent.

Question 4.
Show that sugar, common salt and washing soda are soluble while chalk powder, iodine and sand are insoluble in water.
Answer:
Take six test tubes, fill each of them about half with water. Keep each of them in a test tube stand. Add a pinch of each of six substances in separate test tubes. Shake well and allow them to stand for few minutes. Common salt, sugar and washing soda dissolves while iodine, chalk powder and sand do not dissolves in water.

Question 5.
Write an experiment to show that our palm is translucent.
Answer:

Cover the glass of a torch with your palm at a dark place. Switch on the torch and observe from the other side of the palm. We see that light of torch passes through palm but not clearly. This experiment shows that our palm becomes translucent when a strong beam of light passes through it.

Question 6.
Discuss important properties of matter on the basis of which we can classify them.
Answer:
Some important properties of matter are discussed below:

1. Appearance: Materials can be classified on the basis of their appearance. Different materials have different appearances.
2. Lustre: Materials can be classified on the basis of their lustre. Some.shine a lot whereas others are quite dull.
3. Solubility in water: On the basis of solubility in water, substances are classified as soluble and insoluble.
4. Transparency: Almost all light can pass through transparent substances. No light can pass through opaque substances. Light can pass partially through translucent substances.
5. Density: Density is mass per unit volume of a substance. On the basis of density some substances can float and some get sink in water or other liquid.

Question 7.
Discuss the solubility of gases in water. What is the importance of oxygen gas dissolved in water? How is the carbon dioxide gas dissolved in water helpful to the aquatic plants?
Answer:
Some gases are soluble in water whereas other gases are insoluble in water. Oxygen gas is soluble in water. The plants and animals which live in water use the oxygen dissolved in water for respiration. Thus, oxygen dissolved in water is very important for the survival of animals and plants that live in water.

Carbon dioxide gas is also soluble in water. The plants which live in water use the carbon dioxide gas dissolved in water for the process of photosynthesis.

Question 8.
Compare the properties of solid, liquid and gas.
Answer:

Sorting Materials Into Groups Class 6 Extra Questions HOTS

Question 1.
Why some metals like iron or copper lose their lustre on exposure to air?
Answer:
Iron and copper react with the oxygen and moisture present in air and form a rusted or corroded layer on its surface.

Question 2.
Why some substances sink while other float on water?
Answer:
Substances which have relative density more than water sinks in water but substances which have relative density less than water floats on water.

Question 3.
Do surface area plays any role in sinking or floating of substances?
Answer:
Yes.

Question 4.
You are provided with three liquids-water, honey and oil. On pouring the three liquids simultaneously without disturbing. What will be the arrangement of these liquids from top to bottom?
Answer:
Arrangement of liquids from top to bottom is: Oil ➝ water ➝ honey.

Question 5.
Name a material which is actually opaque but you can make it translucent with a little effort.
Answer:
Paper is opaque. We can make it translucent by rubbing a little oil on it.

Question 6.
Do you think all metals are hard? Name one hardest non-metal.
Answer:
No, because metal like sodium is soft and mercury is a liquid. Hardest non-metal known is diamond.

Sorting Materials Into Groups Class 6 Extra Questions Value Based Question (VBQs)

Question 1.
Ram and Shyam, both friends, opened a new grocery shop. They bought many materials from the main market. Shyam arranged all items systematically based on their similarities and differences. Ram did not arranged the items. He just put them randomly according to the available space in his shop.
(a) What is the significance of grouping items?
(b) Suppose you are a grocer, how will you arrange items in your shop?
(c) Who do you think will be able to locate things in their shop easily-Ram or Shyam? Why?
(d) What values of Ram and Shyam are shown here?
Answer:
(a) Grouping items based on their similarities or differences helps us in locating objects easily.
(b) Being a grocer, I will separate eatables from non-eatables then I will arrange all brands of biscuits, cakes, toffees, soaps, detergents, household items, etc., shelvewise. I will keep gunny bags of grains and pulses at safer and drier places.
(c) Shyam will be able to locate things easily because he has arranged items systematically in his shop.
(d) Ram seems to be careless, lazy and inexperienced whereas Shyam seems to be active, professional and intelligent.

Question 2.
Shreya while playing with her elder brother in the garden pool, observed that a wooden block sinks
in water but a wooden plank of same weight floats on water. She was very astonished on seeing this.
Shreya’s brother on seeing such question mark on her face explained the reason.
(a) What is density?
(b) Why some substances float while other sink in water?
(c) Why the wooden plank float on water while the wooden block sink in water though both have same weight?
(d) What value of Shreya is shown here?
Answer:
(a) Density is defined as mass per unit volume of a substance.
(b) Substances that have density lower than water floats while substances that have density less than water sinks in water.
(c) Volume of wooden block is more than the wooden plank as weight of wooden plank is distributed to larger area than the wooden block. So wooden plank floats while wooden block sinks.
(d) Shreya is curious, good observation capacity and intelligent.