Microbes in Human Welfare Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about biofertilizers is incorrect?

Azospirillum is a free-living nitrogen-fixing bacterium.
Rhizobium forms a symbiotic association with leguminous plants.
Cyanobacteria like Nostoc help in nitrogen fixation.
Biofertilizers reduce soil fertility over time.
4

Biofertilizers enhance soil fertility naturally without depletion.

Which microorganism is responsible for the production of lactic acid in dairy products?

Saccharomyces cerevisiae
Lactobacillus
Clostridium butylicum
Aspergillus niger
2

Lactobacillus bacteria ferment lactose into lactic acid, aiding in curd and yogurt formation.

Which of the following bioactive molecules is used as an immunosuppressant?

Statins
Cyclosporin A
Streptokinase
Penicillin
2

Cyclosporin A, produced by *Trichoderma polysporum*, suppresses the immune system and is used in organ transplant patients.

Which of the following bioactive molecules is used as an immunosuppressive agent in organ transplant patients?

Statins
Cyclosporin A
Streptokinase
Penicillin
2

Cyclosporin A, produced by Trichoderma polysporum, is used as an immunosuppressive agent in organ transplant patients.

Which microorganism is used in the biological treatment of oil spills?

Lactobacillus
Pseudomonas
Saccharomyces cerevisiae
Rhizobium
2

Pseudomonas species are capable of degrading petroleum and are used in oil spill bioremediation.

Which of the following statements about microbes in food production is correct?

Lactobacillus helps in curd formation.
Saccharomyces cerevisiae is used in antibiotic production.
Microbes are never used in food fermentation.
Penicillium helps in making ethanol.
1

Lactobacillus ferments lactose in milk, producing lactic acid that leads to curd formation.

Which of the following microbes is used for the production of bioactive molecules called statins?

Aspergillus niger
Monascus purpureus
Trichoderma polysporum
Pseudomonas
2

Monascus purpureus produces statins, which lower cholesterol levels.

Which of the following microbes is used in the production of ethanol?

Saccharomyces cerevisiae
Pseudomonas
Rhizobium
Clostridium
1

Saccharomyces cerevisiae (yeast) is used in the fermentation of sugars to produce ethanol.

Which microbe is used to produce ethanol in commercial industries?

Saccharomyces cerevisiae
Acetobacter
Lactobacillus
Clostridium
1

Saccharomyces cerevisiae (brewer’s yeast) is widely used in ethanol production.

Which of the following microbes is used to produce butyric acid?

Lactobacillus
Clostridium butylicum
Rhizobium
Penicillium
2

Clostridium butylicum is used for the industrial production of butyric acid.

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