MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers Set-B

Microbes in Human Welfare Class 12 Biology MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers Pdf free download. MCQ Questions for Class 12 Biology with Answers were prepared based on the latest exam pattern. We have Provided Microbes in Human Welfare Class 12 Biology MCQs Questions with Answers to help students understand the concept very well.

Class 12 Biology Chapter 10 Quiz

Class 12 Biology Chapter 10 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Microbes in Human Welfare Class 12 Biology MCQ online test

Q1.	The chemical substances produced by some microbes which can kill or retard the growth of other microbes are called
	A.antiseptics
	B.antacids
	C.antibiotics
	D.all of these

Ans: antibiotics

Q2.	Antibiotics are obtained from
	A.bacteria
	B.fungi
	C.actinomycetes
	D.all of these

Ans: all of these

Q3.	Which of the following antibiotics was extensively used to treat American soldiers wounded in World War 11 ?
	A.Neomycin
	B.Bacitracin
	C.Chloramphenicol
	D.Penicillin

Ans: Penicillin

Q4.	Streptomycin is obtained from
	A.Streptomyces griseus
	B.S. cerevisiae
	C.S. venezuelae
	D.S. rimosus

Ans: Streptomyces griseus

Q5.	Integrated Pest Management (IPM) discourages the excessive used of
	A.biological methods
	B.chemical pesticides
	C.mechanical methods
	D.all of these

Ans: chemical pesticides

Q6.	Which of the following is not used as a biopesticide ?
	A.Trichoderma harzianum
	B.Nucleopolyhedrovirus
	C.Xanthomonas campestris
	D.Bacillus thuringiensis

Ans: Xanthomonas campestris

Q7.	Organic farming does not include
	A.green manures
	B.chemical fertilisers
	C.farmyard manures
	D.compost

Ans: chemical fertilisers

Q8.	Organic farming includes
	A.use of fertilisers and pesticides of biological origin
	B.IPM (Integrated Pest Management)
	C.locally developed pest resistant varieties
	D.all of these

Ans: all of these

Q9.	Living organisms used to enrich the nutrient quality of the soil are called as
	A.biocontrol agents
	B.biofertilisers
	C.synthetic fertilisers
	D.natural fertilisers

Ans: natural fertilisers

Q10.	Biofertilisers are
	A.some bacteria and cyanobacteria
	B.fertilisers formed by ploughing in barseem
	C.fertilisers obtained by decay of dead organisms
	D.fertilisers prepared by mixing cattle dung with crop residues

Ans: some bacteria and cyanobacteria

Q11.	Biofertilisers are the living organisms which
	A.bring about soil nutrient enrichment
	B.maximise the ecological benefits
	C.minimise the environmental hazards
	D.all of these

Ans: all of these

Q12.	Which one of the following can be used as biofertiliser in cotton field ?
	A.Azolla-Anabaena
	B.Streptococcus
	C.Azospirillum
	D.Azotobacter chroococcum

Ans: Azotobacter chroococcum

Q13.	The symbiotic association between fungi and roots of higher plants is referred to as
	A.lichen
	B.mycorrhiza
	C.biofertiliser
	D.biocontrol agent

Ans: mycorrhiza

Q14.	Cyanobacteria are
	A.heterotrophs
	B.chemotrophs
	C.autotrophs
	D.organotrophs

Ans: autotrophs

Q15.	Enzyme which has the fibrinolytic effect is
	A.protease
	B.amylase
	C.lipase
	D.streptokinase

Ans: streptokinase

Q16.	Statins used for lowering blood cholesterol level are extracted from
	A.algae
	B.bacteria
	C.viruses
	D.yeast

Ans: yeast

Q17.	Monascus purpureus is a yeast commercially used in the production of
	A.citric acid
	B.ethanol
	C.blood cholesterol lowering statins
	D.streptokinase for removing clots from blood vessels

Ans: blood cholesterol lowering statins

Q18.	is the first step of sewage treatment.
	A.Precipitation
	B.Chlorination
	C.Sedimentation
	D.Aeration

Ans: Sedimentation

Q19.	During the primary treatment of sewage, solid particles that settle down are called
	A.floes
	B.primary sludge
	C.activated sludge
	D.anaerobic sludge

Ans: primary sludge

Q20.	The purpose of biological treatment of waste water is to
	A.reduce BOD
	B.increase BOD
	C.reduce sedimentation
	D.increase sedimentation

Ans: reduce BOD

MCQ Questions for Class 12 Biology

NCERT Solutions for Class 12 Biology

Class 12 Biologys

NCERT SOLUTIONS FOR CLASS 12

MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers

MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers Set-B

Microbes in Human Welfare Class 12 Biology MCQs Questions with Answers

Class 12 Biology Chapter 10 Quiz

Class 12 Biology Chapter 10 MCQ Online Test

Microbes in Human Welfare Class 12 Biology MCQ online test

MCQ Questions for Class 12 Biology

NCERT Solutions for Class 12 Biology

Class 12 Biologys

NCERT Solutions for Class 12 Biology

NCERT Solutions for Class 12 Biology

Class 12 Biology

Class 12 Biology

Class 12 Biology

Class 12 Biology

Biology : Class 12

Biology : Class 12

NCERT Biology Class 12

NCERT Biology Class 12

NCERT Bio Class 12

NCERT Bio Class 12

12th NCERT Biology

12th NCERT Biology

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Class 12 Biology Chapters

MCQ QUESTIONS WITH ANSWER

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