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Published on: 17/10/2025
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test
1.
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4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Bt crops are resistant to pests. Identify the bacterium from whom the gene is isolated for pest resistance.
Bacillus thuringiensis
Bacillus thermusaquaticus
Pseudomonas
Staphylococcus
14.
Select the biocontrol agents.
Trichoderma, Baculovirus, Bacillus thuringiensis
Oscillatoria, Rhizobium, Trichoderma
Nostoc, Azospirillium, Nucleopolyhedrovirus
Bacillus thuringiensis, Tobacco mosaic virus, Aphids
15.
Which is an incorrect statement about fermentation?
Toddy is prepared by fermenting palm sap
The Propionibacterium is used in fermentation of cheese
Fermentation in muscles produces alcohol
The production of CO2 in dough causes puffed up appearance
16.
Propionibacterium produces large holes in swiss cheese due to the
process of oxidation of the dough
formation of large amount of CO2
consumption of carbohydrates
all of these
17.
Monasus purpureus is a yeast used commercially in the production of
ethanol
streptokinase for removing clots from the blood vessels
citric acid
blood cholesterol lowering statins
18.
Nitrogen is absorbed by plants in the form of
\({ NO }_{ \overline { 3 } }\)
NH3
\({ NO }_{ \overline { 2 } }\)
both (a) and (c)
19.
The purpose of biological treatment of waste water is to
reduce BOD
increase BOD
reduce sedimentation
increase sedimentation
20.
Match the items in column 'A' and column 'B' and choose correct answer
| Column 'A' | Column 'B' |
| (i) Lady bird | (a) Methanobacterium |
| (ii) Mycorrhiza | (b) Trichoderma |
| (iii) Biological control | (c) Aphids |
| (iv) Bio-gas | (d) Glomus |
(i)-(b), (ii)-(d), (iii)-(c), (iv)-(a)
(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
(i)-(d), (ii)-(a), (iii)-(b), (iv)-(c)
(i)-(c), (ii)-(b), (iii)-(a), (iv)-(d)
21.
Which of the following is not concerned with biotechnology?
Biogas production
Sewage treatment
Biofertilizers
Wood seasoning
22.
Cyclosporin-A an immunosuppressive drug is produced by
Aspergillus niger
Manascus purpureus
Penicillium notatum
Trichoderma polysporum
23.
Which of the following is maintained for optimum production of vinegar?
Anaerobic condition
Temperature of \(65^{ \circ }C\)
Aerobic condition
Microaerophilic condition
24.
A good example of organic fertilizer which improves phosphorus uptake is
Actinomycetes fungi
Rhizobium
Azospirillum
None of these
25.
Lactic acid is formed by the process of
Actinomycetes fungi
Rhizobium
Azospirillum
None of these
1.
(c)
2.
(a)
3.
(c)
4.
(d)
5.
(c)
6.
(c)
7.
(b)
8.
(d)
9.
(c)
10.
(b)
11.
(a)
12.
(a)
13.
(a)
Bacillus thuringiensis
14.
(a)
Trichoderma, Baculovirus, Bacillus thuringiensis
15.
(c)
Fermentation in muscles produces alcohol
16.
(b)
formation of large amount of CO2
17.
(d)
blood cholesterol lowering statins
18.
(d)
both (a) and (c)
19.
(a)
reduce BOD
20.
(b)
(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
21.
(d)
Wood seasoning
22.
(d)
Trichoderma polysporum
23.
(a)
Anaerobic condition
24.
(c)
Azospirillum
25.
(a)
Actinomycetes fungi
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