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Q.23. Biogas is produced by

  1. aerobic breakdown of biomass
  2. anaerobic breakdown of biomass
  3. with the help of methanogenic bacteria
  4. both (b) and (c)
Answer: (d) both (b) and (c)
Explanation: Biogas is produced by both (b) and (c)

Microbes In Human Welfare : Class - 12th (Biology) Practice Test | MCQs For NEET

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This practice test includes 25 important multiple-choice questions (MCQs) with answers and explanations from the Class 12th Biology Chapter - Microbes In Human Welfare. These questions are very helpful for NEET and other competitive entrance exams after the 12th. 


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Q.1. Integrated Pest Management (IPM) discourages the excessive used of

  1. biological methods
  2. chemical pesticides
  3. mechanical methods
  4. all of these

Q.2. Which of the following is not used as a biopesticide ?

  1. Trichoderma harzianum
  2. Nucleopolyhedrovirus
  3. Xanthomonas campestris
  4. Bacillus thuringiensis

Q.3. Organic farming does not include

  1. green manures
  2. chemical fertilisers
  3. farmyard manures
  4. compost

Q.4. Organic farming includes

  1. use of fertilisers and pesticides of biological origin
  2. IPM (Integrated Pest Management)
  3. locally developed pest resistant varieties
  4. all of these

Q.5. Living organisms used to enrich the nutrient quality of the soil are called as

  1. biocontrol agents
  2. biofertilisers
  3. synthetic fertilisers
  4. natural fertilisers

Q.6. Biofertilisers are

  1. some bacteria and cyanobacteria
  2. fertilisers formed by ploughing in barseem
  3. fertilisers obtained by decay of dead organisms
  4. fertilisers prepared by mixing cattle dung with crop residues

Q.7. Biofertilisers are the living organisms which

  1. bring about soil nutrient enrichment
  2. maximise the ecological benefits
  3. minimise the environmental hazards
  4. all of these

Q.8. Which one of the following can be used as biofertiliser in cotton field ?

  1. Azolla-Anabaena
  2. Streptococcus
  3. Azospirillum
  4. Azotobacter chroococcum

Q.9. The symbiotic association between fungi and roots of higher plants is referred to as

  1. lichen
  2. mycorrhiza
  3. biofertiliser
  4. biocontrol agent

Q.10. Cyanobacteria are

  1. heterotrophs
  2. chemotrophs
  3. autotrophs
  4. organotrophs

Q.11. Enzyme which has the fibrinolytic effect is

  1. protease
  2. amylase
  3. lipase
  4. streptokinase

Q.12. Statins used for lowering blood cholesterol level are extracted from

  1. algae
  2. bacteria
  3. viruses
  4. yeast

Q.13. Monascus purpureus is a yeast commercially used in the production of

  1. citric acid
  2. ethanol
  3. blood cholesterol lowering statins
  4. streptokinase for removing clots from blood vessels

Q.14. During the primary treatment of sewage, solid particles that settle down are called

  1. floes
  2. primary sludge
  3. activated sludge
  4. anaerobic sludge

Q.15. The purpose of biological treatment of waste water is to

  1. reduce BOD
  2. increase BOD
  3. reduce sedimentation
  4. increase sedimentation

Q.16. The masses of bacteria held together by slime and fungal filaments to form mesh-like structures are called as

  1. primary sludge
  2. floes
  3. activated sludge
  4. anaerobic sludge

Q.17. BOD is………..in polluted water and in potable water.

  1. more, less
  2. less, more
  3. less in both
  4. medium in both

Q.18. n the sewage treatment, bacterial floes are allowed to sediment in a settling tank. This sediment is called as

  1. inactivated sludge
  2. activated sludge
  3. primary sludge
  4. secondary sluge

Q.19. Which of the following steps is taken by the Ministry of Environment and Forests to protect rivers from water pollition ?

  1. Ganga Action Plan
  2. Narmada Action Plan
  3. Yamuna Action Plan
  4. Both (a) and (c)

Q.20. Methanogens, growing anaerobically on cellulosic material produce

  1. methane
  2. methane and carbon dioxide
  3. methane and hydrogen
  4. methane, carbon dioxide and hydrogen

Q.21. Which of the following bacteria is present in the rumen of cattle ?

  1. Azotobacter
  2. Rhizobium
  3. Methanobacterium
  4. Azospirillum

Q.22. Process of biogas production is

  1. aerobic process
  2. anaerobic process
  3. active process
  4. passive process

Q.23. Biogas is produced by

  1. aerobic breakdown of biomass
  2. anaerobic breakdown of biomass
  3. with the help of methanogenic bacteria
  4. both (b) and (c)

Q.24. Dragonflies are used to get rid of

  1. mosquitoes
  2. aphids
  3. butterfly caterpillars
  4. both (a) and (b)

Q.25. A microbial biocontrol agent that can be used to control butterfly caterpillars is

  1. Trichoderma polysporum
  2. Bacillus thuringiensis
  3. Streptococcus
  4. mycorrhiza
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