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
- biological methods
- chemical pesticides
- mechanical methods
- all of these
Answer:
(b) chemical pesticides
Explanation: chemical pesticides
Explanation: chemical pesticides
Q.2.
Which of the following is not used as a biopesticide ?
- Trichoderma harzianum
- Nucleopolyhedrovirus
- Xanthomonas campestris
- Bacillus thuringiensis
Answer:
(c) Xanthomonas campestris
Explanation: Xanthomonas campestris is not used as a biopesticide
Explanation: Xanthomonas campestris is not used as a biopesticide
Q.3.
Organic farming does not include
- green manures
- chemical fertilisers
- farmyard manures
- compost
Answer:
(b) chemical fertilisers
Explanation: chemical fertilisers
Explanation: chemical fertilisers
Q.4.
Organic farming includes
- use of fertilisers and pesticides of biological origin
- IPM (Integrated Pest Management)
- locally developed pest resistant varieties
- all of these
Answer:
(d) all of these
Explanation: all of these
Explanation: all of these
Q.5.
Living organisms used to enrich the nutrient quality of the soil are called as
- biocontrol agents
- biofertilisers
- synthetic fertilisers
- natural fertilisers
Answer:
(d) natural fertilisers
Explanation: Living organisms used to enrich the nutrient quality of the soil are called as natural fertilisers
Explanation: Living organisms used to enrich the nutrient quality of the soil are called as natural fertilisers
Q.6.
Biofertilisers are
- some bacteria and cyanobacteria
- fertilisers formed by ploughing in barseem
- fertilisers obtained by decay of dead organisms
- fertilisers prepared by mixing cattle dung with crop residues
Answer:
(a) some bacteria and cyanobacteria
Explanation: These are some bacteria and cyanobacteria
Explanation: These are some bacteria and cyanobacteria
Q.7.
Biofertilisers are the living organisms which
- bring about soil nutrient enrichment
- maximise the ecological benefits
- minimise the environmental hazards
- all of these
Answer:
(d) all of these
Q.8.
Which one of the following can be used as biofertiliser in cotton field ?
- Azolla-Anabaena
- Streptococcus
- Azospirillum
- Azotobacter chroococcum
Answer:
(d) Azotobacter chroococcum
Explanation: Azotobacter chroococcum used as biofertiliser in cotton field
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
- lichen
- mycorrhiza
- biofertiliser
- biocontrol agent
Answer:
(b) mycorrhiza
Explanation: mycorrhiza
Explanation: mycorrhiza
Q.10.
Cyanobacteria are
- heterotrophs
- chemotrophs
- autotrophs
- organotrophs
Answer:
(c) autotrophs
Explanation: Cyanobacteria are autotrophs
Explanation: Cyanobacteria are autotrophs
Q.11.
Enzyme which has the fibrinolytic effect is
- protease
- amylase
- lipase
- streptokinase
Answer:
(d) streptokinase
Explanation: Enzyme which has the fibrinolytic effect is streptokinase
Explanation: Enzyme which has the fibrinolytic effect is streptokinase
Q.12.
Statins used for lowering blood cholesterol level are extracted from
- algae
- bacteria
- viruses
- yeast
Answer:
(d) yeast
Explanation: Statins used for lowering blood cholesterol level are extracted from 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
- citric acid
- ethanol
- blood cholesterol lowering statins
- 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
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
- floes
- primary sludge
- activated sludge
- anaerobic sludge
Answer:
(b) primary sludge
Explanation: solid particles that settle down are called primary sludge
Explanation: solid particles that settle down are called primary sludge
Q.15.
The purpose of biological treatment of waste water is to
- reduce BOD
- increase BOD
- reduce sedimentation
- increase sedimentation
Answer:
(a) reduce BOD
Explanation: The purpose of biological treatment of waste water is to 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
- primary sludge
- floes
- activated sludge
- anaerobic sludge
Answer:
(b) floes
Q.17.
BOD is………..in polluted water and in potable water.
- more, less
- less, more
- less in both
- medium in both
Answer:
(a) more, less
Explanation: 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
- inactivated sludge
- activated sludge
- primary sludge
- secondary sluge
Answer:
(b) activated sludge
Explanation: This sediment is called as 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 ?
- Ganga Action Plan
- Narmada Action Plan
- Yamuna Action Plan
- Both (a) and (c)
Answer:
()
Explanation: Both (a) and (c)
Explanation: Both (a) and (c)
Q.20.
Methanogens, growing anaerobically on cellulosic material produce
- methane
- methane and carbon dioxide
- methane and hydrogen
- methane, carbon dioxide and hydrogen
Answer:
(d) methane, carbon dioxide and hydrogen
Explanation: They produce 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 ?
- Azotobacter
- Rhizobium
- Methanobacterium
- Azospirillum
Answer:
(c) Methanobacterium
Explanation: Methanobacterium is present in the rumen of cattle.
Explanation: Methanobacterium is present in the rumen of cattle.
Q.22.
Process of biogas production is
- aerobic process
- anaerobic process
- active process
- passive process
Answer:
(b) anaerobic process
Explanation: Process of biogas production is anaerobic process
Explanation: Process of biogas production is anaerobic process
Q.23.
Biogas is produced by
- aerobic breakdown of biomass
- anaerobic breakdown of biomass
- with the help of methanogenic bacteria
- both (b) and (c)
Answer:
(d) both (b) and (c)
Explanation: Biogas is produced by both (b) and (c)
Explanation: Biogas is produced by both (b) and (c)
Q.24.
Dragonflies are used to get rid of
- mosquitoes
- aphids
- butterfly caterpillars
- both (a) and (b)
Answer:
(a) mosquitoes
Explanation: mosquitoes
Explanation: mosquitoes
Q.25.
A microbial biocontrol agent that can be used to control butterfly caterpillars is
- Trichoderma polysporum
- Bacillus thuringiensis
- Streptococcus
- mycorrhiza
Answer:
(b) Bacillus thuringiensis
Explanation: Bacillus thuringiensis
Explanation: Bacillus thuringiensis
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