Question 1: Palette 1/75

NEET 2026 MCQ

$ \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

Question 2: Palette 2/75

NEET 2026 MCQ

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

Question 3: Palette 3/75

NEET 2026 MCQ

Which of the following is used as a clot buster?

A

Statins

B

Streptokinase

C

Penicillin

D

Cyclosporin A

Question 4: Palette 4/75

NEET 2025 MCQ

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

A

Beer

B

Rum

C

Whisky

D

Brandy

Question 5: Palette 5/75

NEET 2025 MCQ

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

Question 6: Palette 6/75

NEET 2025 MCQ

Streptokinase produced by bacterium Streptococcus is used for

A

Liver disease treatment

B

Removing clots from blood vessels

C

Curd production

D

Ethanol production

Question 7: Palette 7/75

NEET 2025 MCQ

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

Question 8: Palette 8/75

NEET 2024 MCQ

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

Question 9: Palette 9/75

NEET 2024 MCQ

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

Question 10: Palette 10/75

NEET 2022 MCQ

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

Question 11: Palette 11/75

NEET 2022 MCQ

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

Question 12: Palette 12/75

NEET 2021 MCQ

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)

Question 13: Palette 13/75

NEET 2020 MCQ

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

Question 14: Palette 14/75

NEET 2020 MCQ

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)

Question 15: Palette 15/75

NEET 2019 MCQ

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

Question 16: Palette 16/75

NEET 2019 MCQ

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)

Question 17: Palette 17/75

NEET 2019 MCQ

Thiobacillus is a group of bacteria helpful in carrying out :

A

Nitrification

B

Denitrification

C

Nitrogen fixation

D

Chemoautotrophic fixation

Question 18: Palette 18/75

NEET 2019 MCQ

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

Question 19: Palette 19/75

NEET 2019 MCQ

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

Question 20: Palette 20/75

NEET 2019 MCQ

Which of the following is a commercial blood cholesterol lowering agent?

A

Streptokinase

B

Lipases

C

Cyclosporin A

D

Statin

Question 21: Palette 21/75

NEET 2018 MCQ

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

Question 22: Palette 22/75

NEET 2017 MCQ

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

Question 23: Palette 23/75

NEET 2017 MCQ

Which of the following in sewage treatment removes suspended solids ?

A

Secondary treatment

B

Tertiary treatment

C

Primary treatment

D

Sludge treatment

Question 24: Palette 24/75

NEET 2017 MCQ

Select the mismatch :

A

Rhodospirillum - Mycorrhiza

B

Anabaena - Nitrogen fixer

C

Rhizobium - Alfalfa

D

Frania - Alnus

Question 25: Palette 25/75

NEET 2016 MCQ

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

Question 26: Palette 26/75

NEET 2015 MCQ

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)

Question 27: Palette 27/75

NEET 2015 MCQ

The guts of cow and buffalo possess

A

Cyanobacteria

B

Fucus sp

C

Methanogens

D

Chlorella sp

Question 28: Palette 28/75

NEET 2014 MCQ

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

Question 29: Palette 29/75

NEET 2014 MCQ

Which one of the following fungi contains hallucinogens?

A

Morechella esculenta

B

Neurospora sp.

C

Amanita muscaria

D

Ustilago sp.

Question 30: Palette 30/75

NEET 2014 MCQ

An alga which can be employed as food for human being is :

A

Polysiphonia

B

Chlorella

C

Ulothrix

D

Spirogyra

Question 31: Palette 31/75

NEET 2013 MCQ

Microbe used for biocontrol of pest butterfly caterpillars is :

A

Streptococcus sp

B

Trichoderma sp.

C

Saccharomyces cerevisiae

D

Bacillus thuringiensis

Question 32: Palette 32/75

NEET 2013 MCQ

A good producer of citric acid is

A

Clostridium

B

Saccharomyces

C

Aspergillus

D

Pseudomonas

Question 33: Palette 33/75

NEET 2012 MCQ

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

Question 34: Palette 34/75

NEET 2012 MCQ

In gobar gas, the maximum amount is that of :

A

Propane

B

Butane

C

Methane

D

Carbon dioxide

Question 35: Palette 35/75

NEET 2012 MCQ

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)

Question 36: Palette 36/75

NEET 2012 MCQ

A nitrogen - fixing microbe associated with Azolla in rice fields is

A

Tolypothrix

B

Spirulina

C

Frankia

D

Anabaena

Question 37: Palette 37/75

NEET 2012 MCQ

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

Question 38: Palette 38/75

NEET 2012 MCQ

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

A

Penicillin

B

Streptokinase

C

Cyclosporin - A

D

Statins

Question 39: Palette 39/75

NEET 2012 MCQ

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

Question 40: Palette 40/75

NEET 2012 MCQ

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

Question 41: Palette 41/75

NEET 2011 MCQ

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

Question 42: Palette 42/75

NEET 2011 MCQ

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

Question 43: Palette 43/75

NEET 2011 MCQ

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

Question 44: Palette 44/75

NEET 2011 MCQ

Secondary sewage treatment is mainly a :

A

Mechanical process

B

Chemical process

C

Biological process

D

Physical process

Question 45: Palette 45/75

NEET 2011 MCQ

Continuous addition of sugars in 'fed batch' fermentation is done to :

A

obtain antibiotics

B

produce methane

C

purify enzymes

D

degrade sewage

Question 46: Palette 46/75

NEET 2011 MCQ

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

Question 47: Palette 47/75

NEET 2011 MCQ

Organisms called Methanogens are most abundant in a :

A

Polluted stream

B

Hot spring

C

Cattle yard

D

Sulphur rock

Question 48: Palette 48/75

NEET 2011 MCQ

Ethanol is commercially produced through a particular speciesl of :

A

Clostridium

B

Trichoderma

C

Aspergillus

D

Sanccharomyces

Question 49: Palette 49/75

NEET 2011 MCQ

The most common substrate used in distilleries for the production of ethanol is :

A

Ground gram

B

Molasses

C

Soyabean

D

Corn meal

Question 50: Palette 50/75

NEET 2011 MCQ

Which one of the following is not a biofertilizer ?

A

Agrobacterium

B

Nostoc

C

Rhizobium

D

Mycorrhiza

Question 51: Palette 51/75

NEET 2011 MCQ

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

A

Azotobacter

B

Azospirillum

C

Nostoc

D

Rhizobium

Question 52: Palette 52/75

NEET 2010 MCQ

An example of endomycorrhiza is -

A

Nostoc

B

Rhizobium

C

Glomus

D

Agaricus

Question 53: Palette 53/75

NEET 2010 MCQ

The common nitrogen-fixer in paddy fields is –

A

Azospirillum

B

Frankia

C

Rhizobium

D

Oscillatoria

Question 54: Palette 54/75

NEET 2010 MCQ

A common biocontrol agent for the control of plant diseases is –

A

Bacillus thuringiensis

B

Trichoderma

C

Glomus

D

Baculovirus

Question 55: Palette 55/75

NEET 2010 MCQ

Which one of the following not used in organic farming ?

A

Earthworm

B

Oscillatoria

C

Snail

D

Glomus

Question 56: Palette 56/75

NEET 2010 MCQ

Select the correct statement from the following:

A

Methanobacterium is an aerobic bacterium found in rumen of cattle

B

Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria

C

Biogas, commonly called gobar gas, is pure methane

D

Biogas is produced by the activity of aerobic bacteria on animal waste

Question 57: Palette 57/75

NEET 2009 MCQ

Which one of the following pairs is wrongly matched ?

A

Detergents – lipase

B

Fruit juice – pectinase

C

Alcohol – nitrogenase

D

Textile – amylase

Question 58: Palette 58/75

NEET 2009 MCQ

Which of the following is not used as a biopesticide ?

A

Bacillus thringiensis

B

Trichoderma harzianum

C

Nuclear Polyhedral Virus (NPV)

D

Xanthomonas Campestris

Question 59: Palette 59/75

NEET 2008 MCQ

Trichoderma harzianum has proved a useful microorganism for:

A

biological control of soil-borne plant pathogens

B

reclamation of wastelands

C

gene transfer in higher plants

D

bioremediation of contaminated soils

Question 60: Palette 60/75

NEET 2008 MCQ

Nitrogen fixation in root nodules of Alnus is brought about by:

A

Bradyrhizobium

B

Frankia

C

Clostridium

D

Azorhizobium

Question 61: Palette 61/75

NEET 2008 MCQ

Which one of the following proved effective for biological control of nematodal disese in plants?

A

Pisolithus tinctorius

B

Paecilomyces lilacinus

C

Pseudomonas cepacia

D

Gliocladium virens

Question 62: Palette 62/75

NEET 2007 MCQ

Probiotics are-

A

Cancer inducting microbes

B

New kind of food allergens

C

Live microbial food supplement

D

Safe antibiotics

Question 63: Palette 63/75

NEET 2007 MCQ

Which one of the following pairs is wrongly matched ?

A

Methanogens – Gobar gas

B

Yeast – Ethanol

C

Streptomycetes – Antibiotic

D

Coliforms – Vinegar

Question 64: Palette 64/75

NEET 2004 MCQ

A major component of gobar gas is

A

ethane

B

methane

C

butane

D

ammonia

Question 65: Palette 65/75

NEET 2004 MCQ

Which one of the following pairs is not correctly matched ?

A

Spirulina – Single cell protein

B

Streptomyces – Antibiotic

C

Rhizobium – Biofertilizer

D

Serratia – Drug addiction

Question 66: Palette 66/75

NEET 2004 MCQ

Dough kept overnight in warm weather becomes soft and spongy because of :-

A

Cohesion

B

Absorption of carbon dioxide from atmosphere

C

Osmosis

D

Fermentation

Question 67: Palette 67/75

NEET 2004 MCQ

The most thoroughly studied of the known bacteria-plant interactions is the :-

A

Nodulation of Sesbania stems by nitrogen fixing bacteria

B

Cyanobacterial symbiosis with some aquatic ferns

C

Plant growth stimulation by phosphate– solubilising bacteria

D

Gall formation on certain angiosperms by Agrobacterium

Question 68: Palette 68/75

NEET 2003 MCQ

During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undergraded : -

A

Lignin

B

Cellulose

C

Hemi-cellulose

D

Lipids

Question 69: Palette 69/75

NEET 2003 MCQ

Maximum application of animal cell culture technology today is in the production of : -

A

Interfereons

B

Vaccines

C

Edible proteins

D

Insulin

Question 70: Palette 70/75

NEET 2002 MCQ

During the formation of bread it becomes porous due to release of CO₂ by the action of : -

A

Protozoans

B

Bacteria

C

Yeast

D

Virus

Question 71: Palette 71/75

NEET 2002 MCQ

Which bacteria is utilized in Gober gas plant ?

A

Nitrifying bacteria

B

Methanogens

C

Ammonifying bacteria

D

Denitrifying bacteria

Question 72: Palette 72/75

NEET 2001 MCQ

Which of the following is true pair of biofertilizers ?

A

Nostoc and legume

B

Rhizobium and grasses

C

Salmonella & E. Coli

D

Azolla and BGA

Question 73: Palette 73/75

NEET 2001 MCQ

Spoilage of oil can be detected by which fatty acid : -

A

Linolenic acid

B

Erusic acid

C

Linoleic acid

D

Oleic acid

Question 74: Palette 74/75

NEET 2000 MCQ

Which aquatic fern is used to increase the yield in paddy crop ?

A

Salvinia

B

Isoetes

C

Marsilea

D

Azolla

Question 75: Palette 75/75

NEET 2000 MCQ

Which of the following is used to manufacture ethanol from starch ?

A

Saccharomyces

B

Lactobacillus

C

Azotobactor

D

Penicilline