Microbes in Human Welfare

Q1 FREE PREVIEW

PYQ

Select the correct group of biocontrol agents. [NEET 2019]

aBacillus thuringiensis, Tobacco mosaic virus, Aphids

bTrichoderma, Baculovirus, Bacillus thuringiensis

cOscillatoria, Rhizobium, Trichoderma

dNostoc, Azospirillum, Nucleopolyhedrovirus

✓ Correct answer: b) Trichoderma, Baculovirus, Bacillus thuringiensis

ExplanationFungus Trichoderma, Baculoviruses (NPV) and Bacillus thuringiensis are used as biocontrol agents.Rhizobium, Nostoc, Azospirillum and Oscillatoria are used as biofertilisers, whereas TMV is a pathogen and aphids are pests that harm crop plants.

Q2 FREE PREVIEW

PYQ

Which of the following is used as a clot buster?

[Re-NEET 2026]

a

Streptokinase

b

Penicillin

c

Cyclosporin A

d

Statins

✓ Correct answer: a)

Streptokinase

Explanation

Streptokinase, produced by the bacterium Streptococcus and modified by genetic engineering, is used as a 'clot buster' for removing clots from the blood vessels of patients who have undergone myocardial infarction.
Penicillin is an antibiotic.
Cyclosporin A is used as an immunosuppressive agent in organ transplant patients.
Statins are blood-cholesterol lowering agents.

Q3

PYQ

Match List-I with List-II relating to microbes and their products :

LIST I	LIST II
A) Streptococcus	I) Citric acid
B) Trichoderma polysporum	II) Clot buster
C) Monascus purpureus	III) Cyclosporin A
D) Aspergillus niger	IV) Statins

Choose the correct answer from the options given below :

[Re-NEET 2024]

a

A-II, B-III, C-IV, D-I

b

A-I, B-II, C-III, D-IV

c

A-I, B-III, C-II, D-IV

d

A-I, B-IV, C-II, D-III

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Q4

PYQ

Which of the following microbes is NOT involved in the preparation of household products?
A. Aspergillus niger
B. Lactobacillus
C. Trichoderma polysporum
D. Saccharomyces cerevisiae
E. Propionibacterium sharmanii
Choose the correct answer from the options given below:

[NEET 2025]

a

C and D only

b

C and E only

c

A and B only

d

A and C only

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Q5

PYQ

Which of the following is an example of non-distilled alcoholic beverage produced by yeast?

[NEET 2025]

a

Beer

b

Rum

c

Whisky

d

Brandy

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Q6

PYQ

Which of following organisms cannot fix nitrogen?
A. Azotobacter B. Oscillatoria
C. Anabaena D. Volvox
E. Nostoc
Choose the correct answer from the options given below:

[NEET 2025]

a

B only

b

E only

c

A only

d

D only

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Q7

PYQ

Match List I with List II :

List I (Bioactive molecules )	List II (Importance)
A. Streptokinase	I. Immunosuppressive agent
B. Statins	II. Removal of clots from the blood vessels
C. Lipases	III Blood cholesterol-lowering agent
D. Cyclosporin A	IV. Detergent Formulations

Choose the correct answer from the options given below :

[NEET 2026]

a

A-II, B-III, C-IV, D-I

b

A-IV, B-III, C-II, D-I

c

A-II, B-III, C-I, D-IV

d

A-III, B-II, C-IV, D-I

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Q8

PYQ

Match List I with List II

List I	List II
A. Clostridium butylicum	I-Ethanol
B. Saccharomyces cerevisiae	II-Streptokinase
C. Trichoderma polysporum	III-Butyric acid
D. Streptococcus sp.	IV-Cyclosporin-A

Choose the correct answer from the options given below:

[NEET 2024]

a

A-IV, B-I, C-III, D-II

b

A-III, B-I, C-II, D-IV

c

A-II, B-IV, C-III, D-I

d

A-III, B-I, C-IV, D-II

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Q9

PYQ

What is the reason behind production of large holes in 'Swiss Cheese' ?

[NEET 2026]

a

The production of large amount of \({\mathrm{CO}}_{2}\) by Clostridium butylicum

b

The production of large amount of \({\mathrm{CO}}_{2}\) and \({\mathrm{H}}_{2}\) by Trichoderma polysporum

c

The production of large amount of \({\mathrm{CO}}_{2}\) and \({\mathrm{H}}_{2}\) by lactic acid bacteria called Lactobacillus

d

The production of large amount of \({\mathrm{CO}}_{2}\) by Propionibacterium sharmanii

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Q10

PYQ

Streptokinase produced by bacterium Streptococcus is used for

[NEET 2025]

a

Liver disease treatment

b

Removing clots from blood vessels

c

Curd production

d

Ethanol production

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Q11

PYQ

Match List - I with List - II.

	List - I		List - II
(p)	Aspergillus niger	(i)	Acetic acid
(q)	Acetobacter aceti	(ii)	Lactic Acid
(r)	Clostridium butylicum	(iii)	Citric Acid
(s)	Lactobacillus	(iv)	Butyric Acid

Choose the correct answer from the option given below.

[NEET 2021]

a

p-iv q-ii r-i s-iii

b

p-iii q-i r-iv s-ii

c

p-i q-ii r-iii s-iv

d

p-ii q-iii r-i s-iv

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Q12

PYQ

Given below are two statements :
Statement 1 : Antibiotics are chemicals produced by microbes that kill other microbes.
Statement 2 : Antibodies are chemicals formed in body that eliminate microbes.
In the light of the above statements, choose the most appropriate answer from the options given below.

[Re-NEET 2024]

a

Statement 1 is correct but Statement 2 is incorrect.

b

Statement 1 is incorrect but Statement 2 is correct.

c

Both Statement 1 and Statement 2 are correct

d

Both Statement 1 and Statement 2 are incorrect.

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Q13

PYQ

For the commercial and industrial production of Citric Acid, which of the following microbes is used?

[Re-NEET 2020]

a

Lactobacillus sp

b

Saccharomyces cerevisiae

c

Clostridium butylicum

d

Aspergillus niger

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Q14

PYQ

Which of the following is put into anaerobic sludge digester for further sewage treatment?

[NEET 2020]

a

Floating debris

b

Effluent of primary treatment

c

Activated sludge

d

Primary sludge

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Q15

PYQ

Which of the following is the pair of biofertilizers?

a

Azolla and BGA

b

Nostoc and legume

c

Rhizobium and grasses

d

Salmonella and E.coli

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