Microbes in Human Welfare
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which bacterium is commonly used as a biofertilizer for leguminous plants?

Azotobacter
Rhizobium
Clostridium
Methanobacterium
2

Rhizobium forms a symbiotic association with leguminous plants and fixes atmospheric nitrogen.

Which of the following is an example of a free-living nitrogen-fixing bacterium?

Rhizobium
Azospirillum
Penicillium
Saccharomyces
2

Azospirillum is a free-living nitrogen-fixing bacterium that enriches soil fertility.

Which microorganism is used in the commercial production of butyric acid?

Clostridium butylicum
Aspergillus niger
Saccharomyces cerevisiae
Acetobacter aceti
1

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

Which of the following microbes is used in organic farming for biocontrol?

Trichoderma
Escherichia coli
Rhizobium
Pseudomonas
1

Trichoderma is a fungal biocontrol agent used against plant pathogens.

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

Saccharomyces cerevisiae
Clostridium butylicum
Pseudomonas
Rhizobium
2

Clostridium butylicum is used in the industrial production of butanol.

Which of the following statements regarding nitrogen fixation is correct?

Rhizobium is a free-living nitrogen fixer.
Azotobacter forms symbiotic relationships with leguminous plants.
Cyanobacteria like Nostoc can fix atmospheric nitrogen.
Nitrogen fixation occurs only in aerobic conditions.
3

Nostoc is a cyanobacterium that can fix atmospheric nitrogen, enriching soil fertility.

Which of the following statements regarding antibiotics is incorrect?

Penicillin is produced by a fungus.
Tetracycline is produced by Streptomyces.
Erythromycin is derived from fungi.
Antibiotics are ineffective against viral infections.
3

Erythromycin is produced by the bacterium *Saccharopolyspora erythraea*, not fungi.

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

Saccharomyces cerevisiae
Acetobacter aceti
Lactobacillus
Rhizobium
2

Acetobacter aceti is a bacterium used for acetic acid production.

Which of the following microbes is used in the biological control of mosquito larvae?

Bacillus thuringiensis
Pseudomonas
Trichoderma
Bacillus sphaericus
4

Bacillus sphaericus is used as a biocontrol agent to target mosquito larvae.

Which bioactive molecule is obtained from Monascus purpureus?

Cyclosporin A
Statins
Penicillin
Streptokinase
2

Statins, used for lowering cholesterol, are obtained from the yeast Monascus purpureus.

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