Microbes in Human Welfare
Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following microbes is involved in the anaerobic digestion of sewage sludge?

Methanobacterium
Azospirillum
Pseudomonas
Rhizobium
1

Methanobacterium is an anaerobic bacterium that digests sludge and produces methane in biogas plants.

Which microorganism helps in the biocontrol of aphids in agriculture?

Bacillus thuringiensis
Ladybird beetle
Trichoderma
Aspergillus
2

Ladybird beetles are natural predators that help control aphid populations in crops.

Which biofertilizer helps in phosphorus absorption for plants?

Rhizobium
Azotobacter
Glomus
Nostoc
3

Glomus forms mycorrhizal associations with plant roots and enhances phosphorus absorption.

Which of the following microbes is used in the commercial production of butanol?

Clostridium butylicum
Saccharomyces cerevisiae
Bacillus thuringiensis
Methanobacterium
1

Clostridium butylicum is used for the large-scale production of butanol.

Which of the following statements about Bt toxin is incorrect?

Bt toxin is produced by Bacillus thuringiensis.
Bt toxin is harmful to humans.
Bt toxin becomes active in the alkaline gut of insects.
Bt crops have been genetically modified to produce Bt toxin.
2

Bt toxin is insect-specific and does not harm humans.

Which of the following statements about biogas production is correct?

Methanogens help in biogas production.
Biogas plants require oxygen to function.
Biogas mainly consists of nitrogen and oxygen.
Anaerobic bacteria are not involved in biogas production.
1

Methanogens such as Methanobacterium play a crucial role in biogas production.

Which of the following bioactive molecules is used to lower cholesterol levels?

Cyclosporin A
Statins
Streptokinase
Penicillin
2

Statins, produced by Monascus purpureus, help lower blood cholesterol levels.

Which of the following microbes is commonly used for biofertilization in paddy fields?

Azospirillum
Rhizobium
Nostoc
Clostridium
3

Nostoc, a cyanobacterium, fixes atmospheric nitrogen and improves soil fertility in paddy fields.

Which metabolic product of yeast is responsible for the rising of dough in bread-making?

Lactic acid
Ethanol
Carbon dioxide
Acetic acid
3

Yeast produces carbon dioxide during fermentation, which causes the dough to rise.

Which of the following bacteria is used for the commercial production of acetic acid?

Lactobacillus
Acetobacter aceti
Clostridium butylicum
Saccharomyces cerevisiae
2

Acetobacter aceti is used in the production of acetic acid (vinegar).

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