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

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

Answer: (b) chemical pesticides
Explanation: chemical pesticides

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

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

Answer: (c) Xanthomonas campestris
Explanation: Xanthomonas campestris is not used as a biopesticide

Q.3. Organic farming does not include

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

Answer: (b) chemical fertilisers
Explanation: chemical fertilisers

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

Answer: (d) all of these
Explanation: 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

Answer: (d) natural fertilisers
Explanation: Living organisms used to enrich the nutrient quality of the soil are called as 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

Answer: (a) some bacteria and cyanobacteria
Explanation: These are some bacteria and cyanobacteria

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

Answer: (d) 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

Answer: (d) Azotobacter chroococcum
Explanation: Azotobacter chroococcum used as biofertiliser in cotton field

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

Answer: (b) mycorrhiza
Explanation: mycorrhiza

Q.10. Cyanobacteria are

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

Answer: (c) autotrophs
Explanation: Cyanobacteria are autotrophs

Q.11. Enzyme which has the fibrinolytic effect is

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

Answer: (d) streptokinase
Explanation: Enzyme which has the fibrinolytic effect is streptokinase

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

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

Answer: (d) yeast
Explanation: Statins used for lowering blood cholesterol level are extracted from 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

Answer: (c) blood cholesterol lowering statins
Explanation: Monascus purpureus is a yeast commercially used in the production of blood cholesterol lowering statins

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

Answer: (b) primary sludge
Explanation: solid particles that settle down are called primary 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

Answer: (a) reduce BOD
Explanation: The purpose of biological treatment of waste water is to reduce BOD

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

Answer: (b) floes

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

Answer: (a) more, less
Explanation: more, less

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

Answer: (b) activated sludge
Explanation: This sediment is called as activated sludge.

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)

Answer: ()
Explanation: 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

Answer: (d) methane, carbon dioxide and hydrogen
Explanation: They produce 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

Answer: (c) Methanobacterium
Explanation: Methanobacterium is present in the rumen of cattle.

Q.22. Process of biogas production is

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

Answer: (b) anaerobic process
Explanation: Process of biogas production is anaerobic 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)

Answer: (d) both (b) and (c)
Explanation: Biogas is produced by 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)

Answer: (a) mosquitoes
Explanation: mosquitoes

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

Answer: (b) Bacillus thuringiensis
Explanation: Bacillus thuringiensis