Microbes in Human Welfare · Biology · NEET
MCQ (Single Correct Answer)
1
Which of the following is an example of non-distilled alcoholic beverage produced by yeast?
NEET 2025
2
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
3
Streptokinase produced by bacterium Streptococcus is used for
NEET 2025
4
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
5
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:
NEET 2024 (Re-Examination)
6
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
7
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:
NEET 2022 Phase 2
8
Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A :
NEET 2022 Phase 1
9
Match List-I with List-II
Choose the correct answer from the options given below
| 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
NEET 2021
10
Which of the following is put into Anaerobic
sludge digester for further sewage treatment?
NEET 2020 Phase 1
11
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 |
NEET 2020 Phase 1
12
What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?
NEET 2019
13
Select the correct group of biocontrol agents.
NEET 2019
14
Match the following organisms with the products they produce :
Select the correct option.
| (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.
NEET 2019
15
Thiobacillus is a group of bacteria helpful in carrying out :
NEET 2019
16
Which of the following can be used as a biocontrol agent in the treatment of plant disease?
NEET 2019
17
Which of the following is a commercial blood cholesterol lowering agent?
NEET 2019
18
Conversion of milk to curd improves its
nutritional value by increasing the amount of
NEET 2018
19
Which of the following in sewage treatment removes suspended solids ?
NEET 2017
20
Select the mismatch :
NEET 2017
21
Which of the following is correctly matched for the product produced by them ?
NEET 2017
22
Match Column-I with Column-II and select the correct option using the codes given below –
| Column I | Column II |
|---|---|
| (a) Pistils fused together | (i) Gametogenesis |
| (b) Formation of gametes | (ii) Pistillate |
| (c) Hyphae of higher Ascomycetes | (iii) Syncarpous |
| (d) Unisexual female flower | (iv) Dikaryotic |
NEET 2016 Phase 2
23
Which of the following is wrongly matched in the given table?
NEET 2016 Phase 1
24
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 |
AIPMT 2015
25
The guts of cow and buffalo possess
AIPMT 2015 Cancelled Paper
26
An alga which can be employed as food for human being is :
AIPMT 2014
27
Which one of the following fungi contains hallucinogens?
AIPMT 2014
28
What gases are produced in anaerobic sludge digesters ?
AIPMT 2014
29
Microbe used for biocontrol of pest butterfly
caterpillars is :
NEET 2013 (Karnataka)
30
A good producer of citric acid is
NEET 2013
31
In gobar gas, the maximum amount is that of :
AIPMT 2012 Mains
32
Read the following four statements (A-D) :
(A) In transcription, adenosine pairs with uracil
(B) Regulation of lac operon by repressor is referred to as positive regulation
(C) The human genome has approximately 50,000 genes
(D) Haemophilia is a sex-linked recessive disease
How many of the above statements are right ?
(A) In transcription, adenosine pairs with uracil
(B) Regulation of lac operon by repressor is referred to as positive regulation
(C) The human genome has approximately 50,000 genes
(D) Haemophilia is a sex-linked recessive disease
How many of the above statements are right ?
AIPMT 2012 Mains
33
The domestic sewage in large cities :
AIPMT 2012 Mains
34
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) 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
AIPMT 2012 Mains
35
Yeast is used in the production of
AIPMT 2012 Prelims
36
A patient brought to a hospital with myocardial infarction is normally immediately given
AIPMT 2012 Prelims
37
Monascus purpureus is a yeast used commercially in the production of :
AIPMT 2012 Prelims
38
A nitrogen - fixing microbe associated with Azolla in rice fields is
AIPMT 2012 Prelims
39
Which one of the following is an example of carrying out biological control of pests/diseases using
microbes ?
AIPMT 2012 Prelims
40
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) 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 ?
AIPMT 2011 Mains
41
Which one of the following is a wrong matching
of a microbe and its industrial product, while the
remaining three are correct ?:
AIPMT 2011 Mains
42
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 drug used for ______ (A)___ patients is obtained from a species of the organism ______ (B)___ ''.
The one correct option for the two blanks is :
AIPMT 2011 Mains
43
An organism used as a Biofertilizer for raising
soyabean crop is :
AIPMT 2011 Prelims
44
Which of the following is mainly produced by
the activity of anaerobic bacteria on sewage ?
AIPMT 2011 Prelims
45
Secondary sewage treatment is mainly a :
AIPMT 2011 Prelims
46
The most common substrate used in distilleries
for the production of ethanol is :
AIPMT 2011 Prelims
47
Ethanol is commercially produced through a
particular speciesl of :
AIPMT 2011 Prelims
48
Organisms called Methanogens are most
abundant in a :
AIPMT 2011 Prelims
49
Which one of the following is not a biofertilizer ?
AIPMT 2011 Prelims
50
Continuous addition of sugars in 'fed batch'
fermentation is done to :
AIPMT 2011 Prelims
51
An example of endomycorrhiza is -
AIPMT 2010 Mains
52
Select the correct statement from the following:
AIPMT 2010 Prelims
53
The common nitrogen-fixer in paddy fields is –
AIPMT 2010 Prelims
54
Which one of the following not used in organic
farming ?
AIPMT 2010 Prelims
55
A common biocontrol agent for the control of
plant diseases is –
AIPMT 2010 Prelims
56
Which of the following is not used as a
biopesticide ?
AIPMT 2009
57
Which one of the following pairs is wrongly
matched ?
AIPMT 2009
58
Which one of the following proved effective for
biological control of nematodal disese in plants?
AIPMT 2008
59
Nitrogen fixation in root nodules of Alnus is
brought about by:
AIPMT 2008
60
Trichoderma harzianum has proved a useful
microorganism for:
AIPMT 2008
61
Probiotics are-
AIPMT 2007
62
Which one of the following pairs is wrongly
matched ?
AIPMT 2007
63
A major component of gobar gas is
AIPMT 2004
64
The most thoroughly studied of the known
bacteria-plant interactions is the :-
AIPMT 2004
65
Dough kept overnight in warm weather
becomes soft and spongy because of :-
AIPMT 2004
66
Which one of the following pairs is not correctly matched ?
AIPMT 2004
67
Maximum application of animal cell culture
technology today is in the production of : -
AIPMT 2003
68
During anaerobic digestion of organic waste,
such as in producing biogas, which one of the
following is left undergraded : -
AIPMT 2003
69
During the formation of bread it becomes
porous due to release of CO2 by the action of : -
AIPMT 2002
70
Which bacteria is utilized in Gober gas plant ?
AIPMT 2002
71
Spoilage of oil can be detected by which fatty
acid : -
AIPMT 2001
72
Which of the following is true pair of
biofertilizers ?
AIPMT 2001
73
Which aquatic fern is used to increase the yield in
paddy crop ?
AIPMT 2000
74
Which of the following is used to manufacture
ethanol from starch ?
AIPMT 2000