Microbes in Human Welfare Class 12 MCQ Questions With Answers
Microbes In Human Welfare MCQ Class 12 Question 1.
Which gases are produced in anaerobic sludge digesters?
(A) Methane and CO2 only
(B) Methane, hydrogen sulphide and CO2
(C) Methane, hydrogen sulphide and O2
(D) Hydrogen Sulphide and CO2
Answer:
(B) Methane, hydrogen sulphide and CO2
Explanation :
In anaerobic sludge digesters, bacteria produce a mixture of gases like methane, hydrogen sulphide and CO2.
Microbes In Human Welfare Class 12 MCQ Question 2.
Which of the following is used as clotbuster for removing clots from blood vessels of patients who have undergone myocardial infarction?
(A) Cyclosporin
(B) Statins
(C) Streptokinase
(D) Lipase
Answer:
(C) Streptokinase
Explanation :
Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as clotbuster.
Microbes In Human Welfare Class 12 MCQ Questions Question 3.
Conversion of milk to curd improves its nutritional value by increasing the amount of:
(A) Vitamin D
(B) Vitamin E
(C) Vitamin B12
(D) Vitamin A
Answer:
(C) Vitamin B12
Explanation :
Lactic acid bacteria (LAB) grow in milk and convert it to curd thereby improv-ing its nutritional quality bv increasing vitamin B12.
MCQ On Microbes In Human Welfare Class 12 Question 4.
Wastewater treatment generates a large quantity of sludge, which can be treated by
(A) digesters
(B) activated sludge
(C) chemicals
(D) oxidation pond
Answer:
(A) digesters
Explanation:
Sludge is a thick, soft and muddy deposits which can be treated by anaerobic digesters. Anaerobic digesters are large heated tanks in which microorganisms break down biodegradable material in the absence of oxygen. It is then sent to oxidation ponds where heterotrophic bacteria continue the breakdown of the organics and solar ultraviolet (UV) light destroys die harmful bacteria. Chemicals are not used in this treatment.
Microbes In Human Welfare MCQ With Answers Question 5.
Methanogenic bacteria are not found in
(A) rumen of cattle
(B) gobar gas plant
(C) bottom of water-logged paddy fields
(D) activated sludge
Answer:
(D) activated sludge
Explanation : Methanogenic bacteria are an-aerobic microorganisms that grow in the presence of carbon dioxide and produce methane gas. These bacteria are not found in activated sludge. The microbes present in the activated sludge are aerobic bacteria that grow rapidly and form floes.
MCQ On Microbes In Human Welfare Class 12 Question 6.
BOD of wastewater is estimated by measuring the amount of
(A) total organic matter
(B) biodegradable organic matter
(C) oxygen evolution
(D) oxygen consumption
Answer:
(D) oxygen consumption
Explanation :
Biochemical oxygen demand (BOD) is estimated by measuring the amount of oxygen consumption or is a measure of the organic pollution of water. It refers lo the amount of dissolved oxygen required to decompose the organic matter in waste water high BOD indicates heavy pollution with little oxygen remaining for fish.
Microbes In Human Welfare MCQ Questions Class 12 Question 7.
Big holes in Swiss cheese are made by
(A) a machine
(B) a bacterium that produces methane gas
(C) a bacterium producing a large amount of carbon dioxide
(D) a fungus that releases a lot of gases during its metabolic activities
Answer:
(C) a bacterium producing a large amount of carbon dioxide
Explanation :
he large holes in ‘Swiss cheese’ are made due to production of a large amount of CO2 by Propionibacterium sharmanii. It releases carbon dioxide when it consumes the lactic acid and forms bubbles. These bubbles form lilLle air pockets, resulting in the holes of the Swiss cheese.
Class 12 Biology Chapter 10 MCQ Question 8.
The primary treatment of waste water involves the removal of
(A) dissolved impurities
(B) stable particles
(C) toxic substances
(D) harmful bacteria
Answer:
(B) stable particles
Explanation :
The primary treatment of waste water involves the physical removal of both larger and smaller particles (stable particles) from the sewage with the help of filtration and sedimentation. These removals occur in the following stages: (i) Initially, floating debris is removed by sequential filtration, (ii) After that grit (made of soil and small pebbles) are removed bv sedimentation. All these solids it particles that settled form the primary sludge and the supernatant forms the effluent. The effluent is taken for the secondary treatment. ( The primary treatment does not remove the dissolved impurities, toxic substances and harmful bacteria.
Microbes In Human Welfare MCQs Class 12 Question 9.
The technology of biogas production from cow dung was developed in India largely due to the efforts of
(A) Gas Authority of India
(B) Oil and Natural Gas Commission
(C) Indian Agricultural Research Institute and Khadi and Village Industries Commission
(D) Indian Oil Corporation
Answer:
(C) Indian Agricultural Research Institute and Khadi and Village Industries Commission
Explanation :
Biogas (commonly called gobar gas) is produced by using cattle dung. The technology of biogas production from cowdung was developed in India mainly due to the efforts of Indian Agricultural Research Institute (LARI) and Khadi and Village Industries Commission (KVIC).
MCQ Of Chapter 10 Biology Class 12 Question 10.
What would happen if oxygen availability to activated sludge floes is reduced?
(A) It will slow down the rate of degradation of organic matter.
(B) The centre of floes will become anoxic, which would cause death of bacteria and eventually breakage of floes.
(C) Floes would increase in size as anaerobic bacteria would grow around floes.
(D) Protozoa would grow in large numbers.
Answer:
(B) The centre of floes will become anoxic, which would cause death of bacteria and eventually breakage of floes.
Explanation :
Activated sludge microorganisms need oxygen as they oxidise wastes to obtain energy for growth. Insufficient oxygen will slow down or kill off aerobic micro-organisms, make facultative organisms work less efficiently and ultimately lead to the breakage of floes. It will also result in the production of the foulsmelling byproducts of anaerobic decomposition. So, sufficient oxygen must always be sustained in the aeration tank to ensure complete waste stabilisation.
MCQs On Microbes In Human Welfare Class 12 Question 11.
Which one of the following microbes forms symbiotic association with plants and help them in their nutrition?
(A) Axotobacter
(B) Aspetgillus
(C) Glomus
(D) Trichodema
Answer:
(C) Glomus
Explanation :
Glomus is a genus of arbuscular mycorrihizal fungi and, all species form symbiotic relationships with plant roots. They help the plant in the absorption of nutrients, especially phosphorus from soil.
Class 12 Biology Microbes In Human Welfare MCQ Question 12.
A nitrogen-fixing microbe associated with Azolla in rice fields is:
(A) Spirulina
(B) Ambaena
(C) Frankia
(D) Tolypothrix
Answer:
(B) Ambani
Explanation:
The fern, Azolla and the blue-green alga Anabaena azollae maintain a symbiotic relationship. The alga provides nitrogen to the fern, and the fern provides a habitat for the alga. This property of nitrogen fixation has made Azolla extremely important economically in the cultivation of rice.
Microbes In Human Welfare MCQs Pdf Class 12 Question 13.
Which one of the following is an example of carrying out biological control of pests/diseases using microbes?
(A) Trichoderma sp. against certain plant pathogens
(B) Nucleoplyhedrovirus against white rust in Brassica.
(C) Bt-cotton to increase cotton field.
(D) Ladybird beetle against aphids in mustard.
Answer:
(C) Bt-cotton to increase cotton field.
Explanation :
Bl-cotton is genetically modified organism cotton variety, which produces an insecticide to bollworms. It increases yield of cotton due to effective control of three types of bollworms viz, American spoiled pink bollworms.
MCQ Questions On Microbes In Human Welfare Question 14.
The free-living fungus Trichoderma can be used for
(A) killing insects
(B) biological control of plant disease
(C) controlling butterfly caterpillars
(D) producing antibiotics
Answer:
(B) biological control of plant disease
Explanation :
Trichoderma is a free-living fungus which is common in soil and root ecosystems. II is an effective biocontrol agent and used extensively for soilborne diseases. It has been also used successfully against many pathogenic fungi which belong to various genera, viz. Fusarium, Phytophthora and Scelerotia. It may suppress the growth of the disease-causing organisms in the rhizosphere through competition and thus reduce disease development. It produces antibiotics and toxins, such as trichothecenes and a sesquiterpene, and trichodermin, which have a direct effect on other organisms.
MCQs Of Biology Class 12 Chapter 10 Question 15.
Mycorrhiza does not help the host plant in
(A) enhancing its phosphorus uptake capacity.
(B) increasing its tolerance to drought.
(C) enhancing its resistance to root pathogens.
(D) increasing its resistance to insects.
Answer:
(D) increasing its resistance to insects.
Explanation :
Fungi form symbiotic association with the roots of higher plants called mycorrhiz.a (VAM), for example. Glomus. The fungal hyphac symbiont in these associations, absorb phosphorus from soil and passes it to the plant, Plants having such associations show other benefits also, such as resistance to root borne pathogens, tolerance to salinity and draught,and an overall increase in plant growth and development. Mycorrhiza does not help the host plant in increasing its resistance to insects.
MCQ Microbes In Human Welfare Class 12 Question 16.
Which one of the following is not a nitrogen-fixing organism?
(A) Anabaena
(B) Nostoc
(C) Azotobacter
(D) Pseudomonas
Answer:
(D) Pseudomonas
Explanation :
Pseudomonas is a denitrifying bacterium, which converts ammonia and nitrates into free nitrogen. These bacteria are responsible to release free nitrogen in the environment through nitrogen cycle. Anabaena, Nostoc and Azotobacter are niLrogen fixing organisms. Anabaena and Nostoc are types of cyanobacteria which are widely distributed in aquatic and terrestrial environments and can fix atmospheric nitrogen. Azotobacter is free-living bacteria, which absorb free nitrogen from soil, air and convert it into salts of nitrogen like amino acids and enrich soil nutrients.
12th Biology MCQ Questions Question 17.
Bacillus thuringiensis is widely used as :
(A) Insecticide
(B) Weedicides
(C) Rodenticide
(D) All of the above
Answer:
(A) Insecticide
Explanation :
Bacillus thuringiensis is to control butterfly caterpillar. These are available in sachets as dried spores which are mixed with water and sprayed on to vulnerable plants such as brassica and fruit trees, where these are eaten by the insect larvae. In the gut of the larvae, the toxin is released and the larvae get killed.
Microbes MCQ Class 12 Chapter 10 Question 18.
Glomus form a symbiotic relationship with plant
(A) leaves
(B) stem
(C) root
(D) stem and root
Answer:
(C) root
Explanation :
Glomus, is a genus of arbuscular mvcorrhizal fungi and all species form a sym biotic relationship with plant roots. They help the plant in the absorption of nutrients, especially phosphorus from soil.
Microbes In Human Welfare MCQ Class 12 Question 19.
Which pigment gives a pinkish hue to rhizobium induced root nodules.
(A) Leghaemoglobin
(B) Carotenoid
(C) Mauveine
(D) None of the above
Answer:
(A) Leghaemoglobin
Explanation :
Leghaemoglobin is a haem protein with structural and functional similarities to animal myoglobin, is found uniquely in legume root nodules, the sites of
nitrogen fixation which form during symbiotic . association between legumes and soil bacteria I of the genus Rhizobium.
Question 20.
Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.
| Column A | Column B |
| (a) Lady bird | (i) Methanobacterium |
| (b) Mycorrhiza | (ii) Trichoderma |
| (c) Biological control | (iii) Aphids |
| (d) Biogas | (Vi) Glomus |
(A) a – (ii), b – (iv), c – (iii), d – (i)
(B) a – (iii), b – (iv), c – (ii), d – (i)
(C) a – (iv), b – (i), c – (ii), d – (iii)
(D) a – (iii), b – (ii), c – (i), d- – (iv)
Answer:
(B) a – (iii), b – (iv), c – (ii), d – (i)
Explanation:
| Column A | Column B | Explanation |
| (A) | (iii) | Ladybird is the very familiar beetle with red and black marking, used to get rid of Aphids. |
| (B) | (iv) | Fungi form symbiotic association, with the roots of higher plants called mycorrhiza (e.g. ] Glomus) |
| (C) | (ii) | Trichoderma is a fungus and used as a fungicide, it acts a biological control agent for the. treatment of plant disease. |
| (D) | (i) | Methanogens, particularly Methanobacterium, are found in cow dung. These bacteria! grow anaerobically on cellulosic material and produce large amount of methane along! with CO2 and H2. |
Assertion and Reason Based MCQs
Directions: In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
(B) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(C) Assertion (A) is true but reason (R) is false.
(D) Assertion (A) is false but reason (R) is true.
Question 1.
Assertion (A): Bottled fruit juices bought from the market are clearer as compared to those made at home.
Reason (R): They are clarified by pectinases and proteases.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
The juice which is prepared at home is turbid, due to the presence of fibres, pectin, etc. The bottled fruit juices are clearer because they are clarified by pectinases and proteases.
Question 2.
Assertion (A): An inoculum of curd is used for curdling of milk.
Reason (R): It contains Lactobacillus, which improves nutritional quality by increasing Vitamin B12.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
The lactobacillus, produce acids which coagulate and partially digest the milk proteins. An inoculum of curd contains millions of LAB, which convert milk to curd.
Question 3.
Assertion (A): Statin is produced by a yeast called Trichoderma polysporum.
Reason (R): Its used lowers the blood cholesterol level in the body.
Answer:
(D) Assertion (A) is false but reason (R) is true.
Explanation :
Statin is produced by a yeast called Monascus purpureus It is a blood cholesterol-lowering agent.
Question 4.
Assertion (A): Methanogens do not produce oxygen.
Reason (R): Methanogens are obligate anaerobic micro-organisms.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
Methanogens are obligate anaerobic micro-organisms which do not produce oxygen. In the digesters (during secondary treatment of wastewater), heterotrophic microbes (methanogens) anaerobically digest bacteria and fungi in sludge producing mixture of gases such as methane, hydrogen sulphide and CO2 which form the biogas.
Question 5.
Assertion (A): Activated sludge should have the ability to settle quickly.
Reason (R): To absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank.
Answer:
Option (C) is correct.
Explanation:
Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to aeration tank.
Question 6.
Assertion (A): Cyanobacteria increases the soil fertility and also add the organic matter to the soil.
Reason (R): They can fix free nitrogen in the atmosphere.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
Cyanobacteria are aulolrophic microbes that can fix almospheric nitrogen. They are also important biofertilizers that add organic matter to Lire soil.
Question 7.
Assertion (A): Members of the genus Glomus from mycorrhiza.
Reason (R): Mycorrhiza is an association of plants and fungi.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
Glomus is a genus of arbuscular mycorrhizal and form a symbiotic association with plants.
Question 8.
Assertion (A): Rhizobium leguminosarum is a symbiotic bacterium found in the root nodules of leguminous plants.
Reason (R): They have the ability to fix atmospheric nitrogen.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
Rhizobium leguminosarum is symbiotic bacterium that serves as a biofertilizers. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as nutrient.
Question 9.
Assertion (A): Nucleopolyhedrovirus are useful as they are good biocontrol agents.
Reason (R): They are species-specific, narrow spectrum bioinsecticides.
Answer:
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Explanation :
Nucleopolyhedrovirus is from the genus of baculoviruses. They are useful as they are good biocontrol agents. They are species-specific, narrow-spectrum bioinsecticides. They control only species-specific pests, do not affect non-target organisms beneficial insects are conserved they aid in problems no i negative impact on plants or other animals.
Question 10.
Assertion (A): Blue-green algae are popular as bio-fertilisers.
Reason (R): Blue-green algae cause algal bloom in polluted water bodies.
Answer:
(D) Assertion (A) is false but reason (R) is true.
Explanation :
Bluegreen algae are not popular as biofertilisers, besides adding organic matter to the soil and increasing its fertility because they cause algal bloom in polluted water bodies and have copious mucilage that makes the fields slippery.
Case-Based MCQs
Attempt any four sub-parts from each question. Each sub-part carries 1 mark.
I. Read the following and answer any four questions from Q.1 to Q.5 given below:
Villagers in a place near Chambur started planning to make power supply for agricultural purpose from cow dung. They have started a biogas plant for the purpose. Study the flow chart for biogas production given below and answer the following questions.
Question 1.
Biogas is composed of majorly:
(A) methane, CO2 and O2
(B) CO2, H2S, and H
(C) methane, C02
(D) H2S, H and O2
Answer:
(C) methane, CO2
Explanation :
Biogas is composed of Methane (50-70%), CO2(30-40%) with traces of hydrogen sulphide and hydrogen.
Question 2.
In the given flow chart, ‘A’ denotes :
(A) aerobic bacteria
(B) methanogenic bacteria
(C) cellulose-degrading bacteria
(D) yeast and protozoa
Answer:
(B) methanogenic bacteria
Explanation :
The methanogenic bacteria are anaerobic organisms’ that convert CO2 to methane via a sequence of reactions.
Question 3.
What is represented by ‘B’ in the flow chart?
(A) Carbohydrates
(B) Protein polymers
(C) Organic adds
(D) Fat globules
Answer:
(C) Organic adds
Explanation :
In the second stage of bioga production, the simple soluble compounds or monomers are acted upon by fermentation causing microbes and converted into organic adds especially acetic add.
Question 4.
‘C’ in the given flow chart represents:
(A) aerobic breakdown of complex organic compounds
(B) anaerobic digestion of complex organic compounds
(C) fermentation of organic compounds
(D) fermentation of monomers.
Answer:
(B) anaerobic digestion of complex organic compounds
Explanation :
‘C in the given flow chart rep-resents anaerobic digestion of complex organic compounds.
Question 5.
If ‘A’ is not added in the procedure
(A) methane will not be formed
(B) CO2 will not be formed
(C) organic compounds will not be converted to H2S
(D) O2 will not be formed
Answer:
(A) methane will not be formed
Explanation : If methanogenic bacteria is not added in the procedure methane formation will not take place.
II. Read the following text aind answer any four questions on the basis of the same :
Ecological Indicators: The presence of dragonflies can reveal changes in the water ecosystems more quickly than studying other animals or plants. In fact, from the nymph to the adult stage, the dragonfly has a significant, positive ecological impact. Dragonfly eggs are laid and hatched in or near water, so their lives show on impact on both water and land ecosystems. Once hatched, dragonfly nymphs can breathe in the air or underwater which enables them to eat mosquito larvae, other aquatic insects and worms, and even small aquatic vertebrates like tadpoles and small fish. Adult dragonflies capture and eat adult mosquitoes. Community wide mosquito control programs that spray insecticides to kill adult mosquitoes also kill dragonflies.
Question 1.
The approach to biological control includes :
(A) Import and release of an insect pest to a new area to provide hosts for natural enemies.
(B) Import and release of natural enemies from the native home of an alien insect pest that has invaded a new area.
(C) Preservation of natural enemies (predators & parasites) that are already established in an area.
(D) Use of insecticides to reduce alien insect pests to establish new equilibrium position.
Answer:
(A) Import and release of an insect pest to a new area to provide hosts for natural enemies.
Explanation :
The approach to biological control includes Preservation of natural encmies(prcdators & parasites) that are alii ready established in anarea.
Question 2.
Two diseases less likely to occur in a region with plenty of dragonflies are
(A) Yellow fever and amoebic dysentery
(B) Malaria and Yellow fever
(C) Anthrax and typhoid
(D) Cholera and typhoid
Answer:
(B) Malaria and Yellow fever
Explanation :
Two diseases less likely to occur in a region with plenty of dragonflies are Maaria and Yellow fever.
Question 3.
Dragonflies indicate positive ecological impact as:
(A) The presence of dragonflies indicates polluted water.
(B) Dragonfly nymphs selectively eat mosquito larvae.
(C) They help to decrease the probability of diseases spread by vectors.
(D) Dragonfly do not cause any harm to beneficial species.
Answer:
(C) They help to decrease the probability of diseases spread by vectors.
Explanation :
Adult dragonflies arc beneficial because the eat pest, flying insects, particular Ivmidges and mosquitoes and help to decrease the probability of diseases spread bv vectors.
Question 4.
The most effective stages in the life cycle of dragonflies that eradicating mosquitoes area.
(A) Larvae and adult
(B) Caterpillar and adult
(C) Nymph and adult
(D) Pupa and adult
Answer:
(C) Nymph and adult
Explanation :
Dragonflies are large and heavybodied insects. The larvae (or Nymphs), which live in water, eat almost anything living that is smaller than themselves. The adult dragonfly larvae are even known to catch and eat small fish. Usually they eat bloodworms or other aquatic insect larvae. Dragonfly nymphs are such good hunters because they move really fastby what looks like jet propulsion. One of the benefits of having dragonflies live nearby is that they eat many times their weight in mosquitoes every day. Dragonflies also eat many different kinds of flies. Using a basketlike arrangement of their legs, adult drag onflies can actually catch and eat other bugs while they are flying.
Question 5.
Assertion: Releasing dragonflies in areas where there is an outbreak of malarial diseases can be an environment-friendly method of control.
Reason: Dragonflies are dominant species and will not allow mosquitoes to reproduce.
(A) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(B ) Both assertion and reason are true, but the reason is not the correct explanation of the assertion. .
(C) Assertion is true but reason is false.
(D) Both assertion and reason are false.
Answer:
(C) Assertion is true but reason is false.
Explanation :
Dragonflies have role in controlling the mosquitoes population and ultimately malarial disease as they are predators on them but they have no role to allow mosquitoes to reproduce.
III. Read the following text and answer the any four questions on the basis of the same:
Large quantities of sewage is generated every day in cities and towns, which is treated in Sewage Treatment Plants (STPs) to make it less polluted. Given below is the flow diagram of one of the stages of STP Observe the given flow diagram and answer the questions accordingly.
Question 1.
Primary effluent is passed into large aeration tanks:
(A) To allow bacterial floes to settle down
(B) To allow fast growth of useful aerobic microbes into floes
(C) To allow anaerobic sludge digestion
(D) None of these
Answer:
(C) To allow anaerobic sludge digestion
Explanation :
The primary effluent is trans-ferred into large aeration tanks where it is constantly agitated mechanically and the air having oxygen is pumped into it which allows fast growth of useful aerobic microbes into floes (masses of bacteria associated with fungal filaments to form mesh-like structures).
Question 2.
Technical term used for sediment formed in sewage treatment is:
(A) Floes
(B) Effluents
(C) Activated sludge
(D) Anerobic sludge
Answer:
(B) Effluents
Explanation :
The effluent after primary treatment is passed into the settling tank where the bacterial ‘floes’ are allowed to settle down and this sediment is called Activated sludge. A small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum(starter).
Question 3.
The significance of the above sediment formed is that:
(A) It acts as inoculum
(B) It serves in formation of floes
(C) It helps in formation of natural water bodies
(D) It helps in anerobic sludge digestion
Answer:
(A) It acts as inoculum
Explanation :
The activated sludge is pumped back into the aeration tank to serve as the inoculum(starter).
Question 4.
Identify the correct set of gases produced during digestion of sludge:
(A) methane, hydrogen sulphide and carbon dioxide
(B) methane, sulphur and carbon dioxide
(C) carbon monooxide, methane, hydrogen sulphide
(D) methane, hydrogen sulphide and nitrogen
Answer:
(A) methane, hydrogen sulphide and carbon dioxide
Explanation :
During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide, and carbon dioxide. These gases form biogas and can be used as a source of energy. The treated effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams.
Question 5.
The technology of biogas production from cow dung was developed in India largely due to the efforts of:
(A) Gas authority of India
(B) Oil and Natural Gas Commission
(C) Indian Agriculture Research Institute, Khadi and Village Industries Commission.
(D) Indian Oil Corporation
Answer:
(C) Indian Agriculture Research Institute, Khadi and Village Industries Commission.