CBSE Class 12 Biology Sample Papers 2015 Set D

SECTION A

1. Fitness according to Darwin refers to reproductive fitness. Explain.

2. Name the hormones secrete by the human female during pregnancy.

3. How many types of glycoproteins that determine blood groups are found on the surface of human RBCs?

4. Why is lactose called the inducer of the lac operon?

5. How are the cells of tapetum different from cells of other layers?

6. What do the tassels in the corn cob represent?

7. Name any 4 human diseases caused by the absence of a protein.

8. Mention one function each of the follicular cells and corpus luteum.

SECTION B

9. Explain steps that ensure cross pollination in autogamous flowers.

10. A diploid organism is heterozygous for 4 loci; how many types of gametes can be produced? Show any 4 gametes.

11. Mention two points of difference between the zona pellucida and corona radiata.

12. State any four differences beteween spermatogenesis and oogenesis.

13. How do Hugo de Vries and Darwin differ on their views on evolution?

14. How does Saheli bring about its contraceptive action?

15. Why is cyclosporin taken after kidney transplant?

16. In a nucleus, the number of RNA NTPs is 10 times higher than DNA NTPs, yet only DNA nucleotides are added during replication of DNA. Why?

17. What are we referring to when we say simpler organisms and complex organisms?

18. Expand the following terms :

a) NACO b) MALT c) CMI d) RT

Please click the below link to access CBSE Class 12 Biology Sample Papers 2015 Set D