Microbes in Human Welfare

NEET Biology · 80 questions · Page 3 of 8 · Click an option or "Show Solution" to reveal answer

Q21

Which of the following in sewage treatment removes suspended solids?

A Secondary treatment

B Tertiary treatment

C Primary treatment

D Sludge treatment

Correct Answer

Option C

Solution

Primary treatment is a physical process which involves filtration and sedimentation of big solid waste.

Q22

Which of the following is wrongly matched?

A Streptococcus - Streptokinase - Removal of clot from blood vessel

B Trichoderma polysporum - Cyclosporin A - Immunosuppressive drug

C Monascus purpureus - Statins - Lowering of blood cholesterol

D Clostridium butylicum - Lipase - Removal of oil stains

Correct Answer

Option D

Solution

Clostridium butylicum helps in the production of butyric acid, not lipase.

Q23

Monascus purpureus is a yeast used commercially in the production of :

A Ethanol

B Streptokinase for removing clots from the blood vessels

C Citric acid

D Blood cholesterol lowering statins

Correct Answer

Option D

Solution

Statins are produced by the yeast Monascus purpureus which have been commercialised as blood-cholesterol lowering agents.

Q24

Yeast is used in the production of

A Citric acid and lactic acid

B Lipase and pectinase

C Bread and beer

D Cheese and butter

Correct Answer

Option C

Solution

Saccharomyces cerevisiae is a yeast used in making bread (Baker's yeast) and commercial production of ethanol/beer.

Q25

Which one of the following is an example of carrying out biological control of pests/diseases using microbes?

A Trichoderma sp. against certain plant pathogens

B Lady bird beetle against aphids in mustard

C Nucleopolyhedrovirus against white rust in Brassica

D Bt-cotton to increase cotton yield

Correct Answer

Option A

Solution

Trichoderma species are free living fungi effective biocontrol agents of several plant pathogens.

Q26

A patient brought to a hospital with myocardial infarction is normally immediately given

A Penicillin

B Streptokinase

C Cyclosporin-A

D Statins

Correct Answer

Option B

Solution

Streptokinase is immediately given to dissolve the thrombus causing myocardial infarction.

Q27

Which one of the following is a wrong matching of a microbe and its industrial product?

A Acetobacter aceti - acetic acid

B Clostridium butylicum - lactic acid

C Aspergillus niger - citric acid

D Yeast - statins

Correct Answer

Option B

Solution

Clostridium butylicum produces butyric acid, not lactic acid. Lactic acid is produced by Lactobacillus.

Q28

An organism used as a Biofertilizer for raising soyabean crop is :

A Azotobacter

B Azospirillum

C Nostoc

D Rhizobium

Correct Answer

Option D

Solution

Rhizobium japonicum forms symbiotic association in the roots of the leguminous plant soybean.

Q29

Ethanol is commercially produced through a particular species of :

A Clostridium

B Trichoderma

C Aspergillus

D Saccharomyces

Correct Answer

Option D

Solution

Ethanol is commercially produced through Saccharomyces cerevisiae.

Q30

Which one of the following is not a biofertilizer?

A Agrobacterium

B Nostoc

C Rhizobium

D Mycorrhiza

Correct Answer

Option A

Solution

Agrobacterium tumefaciens is a pathogen of several dicot plants causing gall tumour. It is not a biofertilizer.

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