NCERT Class 12 Biology Gk Questions & Answers

NCERT Class 12 Biology Gk Questions & Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology Gk Questions & Answers

11 Propionibacterium produces large holes in swiss cheese due to the
A formation of large amount of CO2
B consumption of carbohydrates
C process of oxidation of the dough
D all of these

Answer: formation of large amount of CO2
12 The biggest constraint of plant breeding is
A availability of desirable gene in the crop and its wild relatives.
B infrastructure.
C trained manpower.
D transfer of genes from unrelated sources.

Answer: availability of desirable gene in the crop and its wild relatives.
13 Phosphate pollution in a waterbody is brought about by
A fertilizers and sewage.
B phosphate rocks and sewage
C phosphate rock weathering
D fertilizers

Answer: fertilizers and sewage.
14 Ozone hole is the largest over
A Antarctica
B Europe
C Africa
D America

Answer: Antarctica
15 Increase in the concentration of pollutants/chemicals in higher trophic levels, is known as
A biomagnification
B greenhouse effect
C biodegradation
D eutrophication

Answer: biomagnification
16 Inbreeding is carried out in animal husbandry because it
A increases heterozygosity.
B increases homozygosity.
C increases vigour.
D improves the breed.

Answer: increases homozygosity.
17 Breeding of crops to increase the levels of essential nutrients, is called
A biotechnology.
B biofortification.
C biomagnification.
D bioinformatics.

Answer: biofortification.
18 The technique of obtaining a large number of plantlets by tissue culture method is known as
A organ culture.
B micropropagation.
C plantlet culture.
D macropropagation.

Answer: micropropagation.
19 Bacillus thuringiensis is used to control
A insect pests
B bacterial pathogens
C fungal pathogens
D nematodes

Answer: insect pests
20 Anti venom against snake poison contains
A antigens
B antigen-antibody complexes
C antibodies
D enzymes

Answer: antibodies

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