CBSE Class 12 Biology Question Paper 2020 Set B

CBSE Class 12 Biology Question Paper 2020 Set B. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION – A

1. What is the genetic cause of Turner’s syndrome?

2. What is the role of nonsense or stop codons in protein synthesis?

3. Give the technical term for foetal sex determination test based on the chromosomal pattern in the amniotic fluid surrounding the developing embryo.

4. Why is gene encoding for ‘cry’ protein inserted into a crop plant?

5. Name the organism from which Ti plasmid is isolated.

SECTION – B

6. What is the role of lysing enzyme in Biotechnology?

7. Why is C.N.G. better than diesel in automobiles?

8. Draw a labelled diagram of any one of the following :-

Human Sperm

(OR)

Male gametophyte of angiosperms.

9. What is meant by Biotic potential?

10. Explain any two methods of ART that has helped childless couples to bear children.

SECTION – C

11. Write down the function of each of the following:-

a) Middle piece in human sperm

b) Luteinising hormone in human male

c) Acrosomal enzymes

12. a) Mention any four strategies adopted by flowering plants to prevent self pollination.

b) Why is Geitonogamy also referred to as genetical autogamy?

13. a) Explain and draw a cross. Can a child have blood group O if his parents have blood group A and B.

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