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Microbes in Human Welfare

75 Questions Start NEET Test
All Exams NEET AIIMS
2026 Q1 NEET MCQ
08 May 2026

$ \text { Match List I with List II: } $

$
\text { List I (Bioactive molecules) }
$
 $
\text { 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:
A.

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

B.

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

C.

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

D.

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

2026 Q2 NEET MCQ
08 May 2026

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

A.

The production of large amount of $\mathrm{CO}_2$ by Propionibacterium sharmanii

B.

The production of large amount of $\mathrm{CO}_2$ by Clostridium butylicum

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 $\mathrm{CO}_2$ and $\mathrm{H}_2$ by Trichoderma polysporum

2026 Q3 NEET MCQ
28 Jun 2026

Which of the following is used as a clot buster?

A.

Statins

B.

Streptokinase

C.

Penicillin

D.

Cyclosporin A

2025 Q4 NEET MCQ
10 Mar 2026

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

A.
Beer
B.
Rum
C.
Whisky
D.
Brandy
2025 Q5 NEET MCQ
10 Mar 2026

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:

A.
B only
B.
E only
C.
A only
D.
D only
2025 Q6 NEET MCQ
10 Mar 2026

Streptokinase produced by bacterium Streptococcus is used for

A.
Liver disease treatment
B.
Removing clots from blood vessels
C.
Curd production
D.
Ethanol production
2025 Q7 NEET MCQ
10 Mar 2026

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:

A.
C and D only
B.
C and E only
C.
A and B only
D.
A and C only
2024 Q8 NEET MCQ
10 Mar 2026

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

List - I
(Microbes)		 List - II
(Products)
(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:

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
2024 Q9 NEET MCQ
10 Mar 2026

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:

A.
A-III, B-I, C-II, D-IV
B.
A-II, B-IV, C-III, D-I
C.
A-III, B-I, C-IV, D-II
D.
A-IV, B-I, C-III, D-II
2022 Q10 NEET MCQ
10 Mar 2026

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Spirulina is a microbe that can be used for reducing environmental pollution.

Reason (R) : Spirulina is a rich source of protein, carbohydrates, fats, minerals and vitamins.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.
(A) is not correct but (R) is correct
B.
Both (A) and (R) are correct and (R) is the correct explanation of (A)
C.
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
D.
(A) is correct but (R) is not correct
2022 Q11 NEET MCQ
10 Mar 2026

Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A :

A.
Trichoderma polysporum
B.
Clostridium butylicum
C.
Aspergillus niger
D.
Streptococcus cerevisiae
2021 Q12 NEET MCQ
10 Mar 2026
Match List-I with List-II

List-I List-II
(a) Aspergillus niger (i) Acetic Acid
(b) Acetobacter aceti (ii) Lactice Acid
(c) Clostridium butylicum (iii) Citric Acid
(d) Lactobacillus (iv) Butyric Acid


Choose the correct answer from the options given below
A.
(a) (b) (c) (d)
(iv) (ii) (i) (iii)
B.
(a) (b) (c) (d)
(iii) (i) (iv) (ii)
C.
(a) (b) (c) (d)
(i) (ii) (iii) (iv)
D.
(a) (b) (c) (d)
(ii) (iii) (i) (iv)
2020 Q13 NEET MCQ
10 Mar 2026
Which of the following is put into Anaerobic sludge digester for further sewage treatment?
A.
Effluents of primary treatment
B.
Primary sludge
C.
Floating debris
D.
Activated sludge
2020 Q14 NEET MCQ
10 Mar 2026
Match the following columns and select the correct option.
Column-I Column-II
(a) Clostridium butylicum (i) Cyclosporin-A
(b) Trichoderma polysporum (ii) Butyric Acid
(c) Monascus purpureus (iii) Citric Acid
(d) Aspergillus niger (iv) Blood cholesterol lowering agent
A.
(A) $ \to $ (iii), (B) $ \to $ (iv), (C) $ \to $ (ii), (D) $ \to $ (i)
B.
(A) $ \to $ (i), (B) $ \to $ (ii), (C) $ \to $ (iv), (D) $ \to $ (iii)
C.
(A) $ \to $ (iv), (B) $ \to $ (iii), (C) $ \to $ (ii), (D) $ \to $ (i)
D.
(A) $ \to $ (ii), (B) $ \to $ (i), (C) $ \to $ (iv), (D) $ \to $ (iii)
2019 Q15 NEET MCQ
10 Mar 2026
Which of the following can be used as a biocontrol agent in the treatment of plant disease?
A.
Anabaena
B.
Lactobacillus
C.
Trichoderma
D.
Chlorella
2019 Q16 NEET MCQ
10 Mar 2026
Match the following organisms with the products they produce :
(a) Lactobacillus (i) Cheese
(b) Saccharomyces cerevisiae (ii) Curd
(c) Aspergillus nige (iii) Citric Acid
(d) Acetobacter aceti (iv) Bread
(v) Acetic Acid

Select the correct option.
A.
(a) (b) (c) (d)
(iii) (iv) (v) (i)
B.
(a) (b) (c) (d)
(ii) (i) (iii) (v)
C.
(a) (b) (c) (d)
(ii) (iv) (v) (iii)
D.
(a) (b) (c) (d)
(ii) (iv) (iii) (v)
2019 Q17 NEET MCQ
10 Mar 2026
Thiobacillus is a group of bacteria helpful in carrying out :
A.
Nitrification
B.
Denitrification
C.
Nitrogen fixation
D.
Chemoautotrophic fixation
2019 Q18 NEET MCQ
10 Mar 2026
Select the correct group of biocontrol agents.
A.
Oscillatoria, Rhizobium, Trichoderma
B.
Nostoc, Azospirillium, Nucleopolyhedrovirus
C.
Bacillus thuringiensis, Tobacco mosaic virus, Aphids
D.
Trichoderma, Baculovirus, Bacillus thuringiensis
2019 Q19 NEET MCQ
10 Mar 2026
What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?
A.
Acidic pH of stomach
B.
Body temperature
C.
Alkaline pH of gut
D.
Moist surface of midgut
2019 Q20 NEET MCQ
10 Mar 2026
Which of the following is a commercial blood cholesterol lowering agent?
A.
Streptokinase
B.
Lipases
C.
Cyclosporin A
D.
Statin
2018 Q21 NEET MCQ
10 Mar 2026
Conversion of milk to curd improves its nutritional value by increasing the amount of
A.
vitamin D
B.
vitamin A
C.
vitamin B12
D.
vitamin E
2017 Q22 NEET MCQ
10 Mar 2026
Which of the following is correctly matched for the product produced by them ?
A.
Acetobacter aceti : Antibiotics
B.
Penicillium notatum : Acetic acid
C.
Methanobacterium : Lactic acid
D.
Sacchromyces cerevisiae : Ethanol
2017 Q23 NEET MCQ
10 Mar 2026
Which of the following in sewage treatment removes suspended solids ?
A.
Secondary treatment
B.
Tertiary treatment
C.
Primary treatment
D.
Sludge treatment
2017 Q24 NEET MCQ
10 Mar 2026
Select the mismatch :
A.
Rhodospirillum - Mycorrhiza
B.
Anabaena - Nitrogen fixer
C.
Rhizobium - Alfalfa
D.
Frania - Alnus
2016 Q25 NEET MCQ
10 Mar 2026
Which of the following is wrongly matched in the given table?
A.
Microbe - Streptococcus, Product - Streptokinase, Application - Removal of clot from blood vessel
B.
Microbe - Trichoderma polysporum, Product - Cyclosporin A, Application - Immunosuppressive drug
C.
Microbe - Monascus purpureus, Product - Statins, Application - Lowering of blood cholesterol
D.
Microbe - Clostridium butylicum , Product - Lipase, Application - Removal of oil stains
2015 Q26 NEET MCQ
10 Mar 2026
Match the following list of microbes and their importance -
Column I Column II
(a) Sacharomyces cerevisiae (i) Production of immunosuppressive agent
(b) Monascus purpureus (ii) Ripening of Swiss cheese
(c) Trichoderma polysporum (iii) Commercial production of ethanol
(d) Propionibacterium sharmanii (iv) Production of blood cholesterol lowering agents
A.
(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)
B.
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
C.
(a) - (iv), (b) - (ii), (c) - (i), (d) - (iii)
D.
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
2015 Q27 NEET MCQ
10 Mar 2026
The guts of cow and buffalo possess
A.
Cyanobacteria
B.
Fucus sp
C.
Methanogens
D.
Chlorella sp
2014 Q28 NEET MCQ
10 Mar 2026
What gases are produced in anaerobic sludge digesters ?
A.
Methane and CO2 only
B.
Methane, Hydrogen Sulphide and O2
C.
Methane, Hydrogen Sulphide and CO2
D.
Hydrogen Sulphide and CO2
2014 Q29 NEET MCQ
10 Mar 2026
Which one of the following fungi contains hallucinogens?
A.
Morechella esculenta
B.
Neurospora sp.
C.
Amanita muscaria
D.
Ustilago sp.
2014 Q30 NEET MCQ
10 Mar 2026
An alga which can be employed as food for human being is :
A.
Polysiphonia
B.
Chlorella
C.
Ulothrix
D.
Spirogyra
2013 Q31 NEET MCQ
10 Mar 2026
Microbe used for biocontrol of pest butterfly caterpillars is :
A.
Streptococcus sp
B.
Trichoderma sp.
C.
Saccharomyces cerevisiae
D.
Bacillus thuringiensis
2013 Q32 NEET MCQ
10 Mar 2026
A good producer of citric acid is
A.
Clostridium
B.
Saccharomyces
C.
Aspergillus
D.
Pseudomonas
2012 Q33 NEET MCQ
10 Mar 2026
The domestic sewage in large cities :
A.
has very high amounts of suspended solids and dissolved salts
B.
has a high BOD as it contains both aerobic and anaerobic bacteria.
C.
is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plant (STPs)
D.
When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
2012 Q34 NEET MCQ
10 Mar 2026
In gobar gas, the maximum amount is that of :
A.
Propane
B.
Butane
C.
Methane
D.
Carbon dioxide
2012 Q35 NEET MCQ
10 Mar 2026
Consider the following four statements (a-d) and select the option which includes all the correct ones only :
(a) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc.
(b) Body weight-wise the microorganisms Methylophilus methylotrophus may be able to produce several times more proteins than the cow per day
(c) Common button mushrooms are a very rich source of vitamin C
(d) A rice variety has been developed which is very rich in calcium
A.
Statements (b), (c) and (d)
B.
Statements (c), (d)
C.
Statements (a), (c) and (d)
D.
Statements (a), (b)
2012 Q36 NEET MCQ
10 Mar 2026
A nitrogen - fixing microbe associated with Azolla in rice fields is
A.
Tolypothrix
B.
Spirulina
C.
Frankia
D.
Anabaena
2012 Q37 NEET MCQ
10 Mar 2026
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
2012 Q38 NEET MCQ
10 Mar 2026
A patient brought to a hospital with myocardial infarction is normally immediately given
A.
Penicillin
B.
Streptokinase
C.
Cyclosporin - A
D.
Statins
2012 Q39 NEET MCQ
10 Mar 2026
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
2012 Q40 NEET MCQ
10 Mar 2026
Which one of the following is an example of carrying out biological control of pests/diseases using microbes ?
A.
Trichoderms sp. against certain plant pathogens
B.
Lady bird beetle against aphids in mustard
C.
Nucleopoly hedrovirus against white rust in Brassica
D.
Bt-cotton to increase cotton yield
2011 Q41 NEET MCQ
10 Mar 2026
Read the following statement having two blanks (A and B) :
''A drug used for ______ (A)___ patients is obtained from a species of the organism ______ (B)___ ''.
The one correct option for the two blanks is :
A.
A $ \to $ Organ-transplant , B $ \to $ Trichoderma
B.
A $ \to $ AIDS, B $ \to $ Pseudomonas
C.
A $ \to $ Swine flu, B $ \to $ Monascus
D.
A $ \to $ Heart , B $ \to $ Penicillium
2011 Q42 NEET MCQ
10 Mar 2026
Consider the following statements (A-D) about organic farming :
(A) Utilizes genetically modified crops like Bt cotton
(B) Uses only naturally produced inputs like compost
(C) Does not use pesticides and urea
(D) Produces vegetables rich in vitamins and minerals
Which of the above statements are correct ?
A.
(B) and (C) only
B.
(B), (C) and (D)
C.
(C) and (D) only
D.
(A) and (B) only
2011 Q43 NEET MCQ
10 Mar 2026
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct ?:
A.
Acetobacter aceti – acetic acid
B.
Clostridium butylicum – lactic acid
C.
Aspergillus niger – citric acid
D.
Yeast – statins
2011 Q44 NEET MCQ
10 Mar 2026
Secondary sewage treatment is mainly a :
A.
Mechanical process
B.
Chemical process
C.
Biological process
D.
Physical process
2011 Q45 NEET MCQ
10 Mar 2026
Continuous addition of sugars in 'fed batch' fermentation is done to :
A.
obtain antibiotics
B.
produce methane
C.
purify enzymes
D.
degrade sewage
2011 Q46 NEET MCQ
10 Mar 2026
Which of the following is mainly produced by the activity of anaerobic bacteria on sewage ?
A.
Propane
B.
Mustard gas
C.
Marsh gas
D.
Laughing gas
2011 Q47 NEET MCQ
10 Mar 2026
Organisms called Methanogens are most abundant in a :
A.
Polluted stream
B.
Hot spring
C.
Cattle yard
D.
Sulphur rock
2011 Q48 NEET MCQ
10 Mar 2026
Ethanol is commercially produced through a particular speciesl of :
A.
Clostridium
B.
Trichoderma
C.
Aspergillus
D.
Sanccharomyces
2011 Q49 NEET MCQ
10 Mar 2026
The most common substrate used in distilleries for the production of ethanol is :
A.
Ground gram
B.
Molasses
C.
Soyabean
D.
Corn meal
2011 Q50 NEET MCQ
10 Mar 2026
Which one of the following is not a biofertilizer ?
A.
Agrobacterium
B.
Nostoc
C.
Rhizobium
D.
Mycorrhiza