Integrated Pest Management (IPM) discourages the excessive used of

b) chemical pesticides | chemical pesticides

Which of the following is not used as a biopesticide ?

c) Xanthomonas campestris | Xanthomonas campestris is not used as a biopesticide

Organic farming does not include

b) chemical fertilisers | chemical fertilisers

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

d) natural fertilisers | Living organisms used to enrich the nutrient quality of the soil are called as natural fertilisers

a) some bacteria and cyanobacteria | These are some bacteria and cyanobacteria

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

d) Azotobacter chroococcum | Azotobacter chroococcum used as biofertiliser in cotton field

c) autotrophs | Cyanobacteria are autotrophs

Enzyme which has the fibrinolytic effect is

d) streptokinase | Enzyme which has the fibrinolytic effect is streptokinase

Statins used for lowering blood cholesterol level are extracted from

d) yeast | Statins used for lowering blood cholesterol level are extracted from yeast

Monascus purpureus is a yeast commercially used in the production of

c) blood cholesterol lowering statins | Monascus purpureus is a yeast commercially used in the production of blood cholesterol lowering statins

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

b) primary sludge | solid particles that settle down are called primary sludge

The purpose of biological treatment of waste water is to

a) reduce BOD | The purpose of biological treatment of waste water is to reduce BOD

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

b) activated sludge | This sediment is called as activated sludge.

Methanogens, growing anaerobically on cellulosic material produce

d) methane, carbon dioxide and hydrogen | They produce methane, carbon dioxide and hydrogen.

Process of biogas production is

b) anaerobic process | Process of biogas production is anaerobic process

Biogas is produced by

d) both (b) and (c) | Biogas is produced by both (b) and (c)

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

b) Bacillus thuringiensis | Bacillus thuringiensis

Which of the following bacteria is present in the rumen of cattle ?

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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.

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

25 Questions 7 Attempts 4.31K Seen

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.No.	Que title	Option 1 (a)	Option 2 (b)	Option 3 (c)	Option 4 (d)
1	Integrated Pest Management (IPM) discourages the excessive used of	biological methods	chemical pesticides	mechanical methods	all of these
2	Which of the following is not used as a biopesticide ?	Trichoderma harzianum	Nucleopolyhedrovirus	Xanthomonas campestris	Bacillus thuringiensis
3	Organic farming does not include	green manures	chemical fertilisers	farmyard manures	compost
4	Organic farming includes	use of fertilisers and pesticides of biological origin	IPM (Integrated Pest Management)	locally developed pest resistant varieties	all of these
5	Living organisms used to enrich the nutrient quality of the soil are called as	biocontrol agents	biofertilisers	synthetic fertilisers	natural fertilisers
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
7	Biofertilisers are the living organisms which	bring about soil nutrient enrichment	maximise the ecological benefits	minimise the environmental hazards	all of these
8	Which one of the following can be used as biofertiliser in cotton field ?	Azolla-Anabaena	Streptococcus	Azospirillum	Azotobacter chroococcum
9	The symbiotic association between fungi and roots of higher plants is referred to as	lichen	mycorrhiza	biofertiliser	biocontrol agent
10	Cyanobacteria are	heterotrophs	chemotrophs	autotrophs	organotrophs
11	Enzyme which has the fibrinolytic effect is	protease	amylase	lipase	streptokinase
12	Statins used for lowering blood cholesterol level are extracted from	algae	bacteria	viruses	yeast
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
14	During the primary treatment of sewage, solid particles that settle down are called	floes	primary sludge	activated sludge	anaerobic sludge
15	The purpose of biological treatment of waste water is to	reduce BOD	increase BOD	reduce sedimentation	increase sedimentation
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
17	BOD is………..in polluted water and in potable water.	more, less	less, more	less in both	medium in both
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
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)
20	Methanogens, growing anaerobically on cellulosic material produce	methane	methane and carbon dioxide	methane and hydrogen	methane, carbon dioxide and hydrogen
21	Which of the following bacteria is present in the rumen of cattle ?	Azotobacter	Rhizobium	Methanobacterium	Azospirillum
22	Process of biogas production is	aerobic process	anaerobic process	active process	passive process
23	Biogas is produced by	aerobic breakdown of biomass	anaerobic breakdown of biomass	with the help of methanogenic bacteria	both (b) and (c)
24	Dragonflies are used to get rid of	mosquitoes	aphids	butterfly caterpillars	both (a) and (b)
25	A microbial biocontrol agent that can be used to control butterfly caterpillars is	Trichoderma polysporum	Bacillus thuringiensis	Streptococcus	mycorrhiza

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