Microbes in Human Welfare Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements regarding methanogens is correct?

Methanogens play a role in secondary sewage treatment.
Methanogens help in biogas production.
Methanogens are aerobic bacteria.
Methanogens are responsible for nitrification in soil.
2

Methanogens such as Methanobacterium help in biogas production by breaking down organic matter anaerobically.

Which of the following bioactive molecules is used as a cholesterol-lowering agent?

Cyclosporin A
Streptokinase
Statins
Penicillin
3

Statins, produced by Monascus purpureus, help lower cholesterol levels in humans.

Which bacteria are primarily responsible for nitrogen fixation in the soil?

Pseudomonas and Clostridium
Lactobacillus and Acetobacter
Azotobacter and Rhizobium
Penicillium and Aspergillus
3

Azotobacter (free-living) and Rhizobium (symbiotic) fix atmospheric nitrogen into usable forms for plants.

Which of the following statements about biofertilizers is correct?

Rhizobium forms symbiotic associations with cereals.
Cyanobacteria like Nostoc can fix nitrogen.
Azotobacter is a symbiotic nitrogen fixer.
Biofertilizers reduce soil fertility over time.
2

Cyanobacteria like Nostoc and Anabaena are free-living nitrogen fixers.

Which microbial product is used in detergent formulations to break down fats and oils?

Lipase
Protease
Pectinase
Streptokinase
1

Lipases break down fats and oils and are used in detergent formulations for stain removal.

Which of the following bacteria is commonly used for lactic acid production?

Acetobacter aceti
Lactobacillus
Pseudomonas
Clostridium
2

Lactobacillus is widely used in the production of lactic acid and is important in dairy fermentation.

Which microorganism is used for the production of vinegar (acetic acid)?

Lactobacillus
Acetobacter aceti
Saccharomyces cerevisiae
Clostridium
2

Acetobacter aceti oxidizes ethanol to produce acetic acid (vinegar).

Which of the following enzymes is obtained from Streptococcus and used to dissolve blood clots?

Lipase
Streptokinase
Protease
Pectinase
2

Streptokinase is an enzyme derived from Streptococcus that helps dissolve blood clots in patients.

Which microbial process is responsible for producing carbon dioxide in dough fermentation?

Photosynthesis
Fermentation
Nitrification
Respiration
2

Fermentation by yeast produces carbon dioxide, which makes dough rise.

Which microorganism is used in the fermentation of bamboo shoots?

Lactobacillus
Saccharomyces cerevisiae
Clostridium
Pseudomonas
1

Lactobacillus helps in the fermentation of bamboo shoots, making them more digestible.

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