NCERT - Microbes in Human Welfare Questions and Answers of Class 12 Biology | Biology - Microbes in Human Welfare MCQs | NCERT Solution of Class 12 Biology Microbes in Human Welfare | NCERT Multiple Choice Questions and Answers of Biology from Chapter Microbes in Human Welfare

Questions

1 Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?

1 Laughing gas

2 Propane

3 Marsh gas

4 Mustard gas

View Answer

Answer: Marsh gas

2 Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by

1 Storing them in underground storage tanks

2 Using them for producing biogas.

3 Vermiculture

4 Using them directly as biofertilizers

View Answer

Answer: Using them for producing biogas.

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3 Which one of the following is used as biological insecticide?

1 Silkmoth

2 Caterpillar

3 Tiger beetle

4 Mazra Poka

View Answer

Answer: Tiger beetle

4 Azolla is used as a biofertilizer because it

1 Has association of nitrogen fixing Cyanobacteria

2 Has association of nitrogen fixing Rhizobium

3 Multiplies very fast to produce massive biomass

4 Has association of mycorrhiza

View Answer

Answer: Has association of nitrogen fixing Cyanobacteria

5 A nitrogen fixing microbe associated with Azolla in rice fields is

1 Frankia

2 Tolypothrix

3 Spirulina

4 Anabaena

View Answer

Answer: Anabaena

6 Physical removal of large and small from the sewage through filtration and sedimentation is called:

1 Primary treatment

2 Secondary treatment

3 Tertiary treatment

4 Quaternary treatment

View Answer

Answer: Primary treatment

7 The yeast that is used in alcohol production and bread making is

1 Escherichia coli

2 Saccharomyces cerevisiae

3 Bacillus subtilis

4 Pseudomonas putida

View Answer

Answer: Saccharomyces cerevisiae

8 In paddy fields biological nitrogen fixation is chiefly brought by

1 Mycorrhiza

2 Green algae

3 Cyanobacteria

4 Rhizobium

View Answer

Answer: Cyanobacteria

9 Which of the following bacterium produces butyric acid?

1 Acetobacter aceti

2 Clostridium butylicum

3 Lactobacillus

4 None of these

View Answer

Answer: Clostridium butylicum

10 Green manure plants used by farmer mainly belong to

1 Solanaceae

2 Compositae

3 Leguminosae

4 Poaceae

View Answer

Answer: Leguminosae

11 The common nitrogen-fixer in paddy fields is

1 Frankia

2 Rhizobium

3 Azospirillum

4 Oscillatoria

View Answer

Answer: Azospirillum

12 Human insulin is being commercially produced from a transgenic species of

1 Saccharomyces

2 Escherichia

3 Mycobacterium

4 Rhizobium

View Answer

Answer: Escherichia

13 Morphine, which is used as an analgesic is obtained from

1 Taxus brevifolia

2 Papaver somniferum

3 Cinchona officinalis

4 Berberis nilghiriensis

View Answer

Answer: Papaver somniferum

14 Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?

1 Glomus

2 Trichoderma

3 Azotobacter

4 Aspergillus

View Answer

Answer: Glomus

15 Yeast is used in the production of

1 Bread and beer

2 Cheese and butter

3 Citric acid and lactic acid

4 Lipase and pectinase

View Answer

Answer: Bread and beer

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