Q1 of 42 Page 1

Why are papaya plants said to be dioecious?

The papaya plant is said to be dioecious because the male and female plants are separate from each other, i.e. different plants bear the male and female flowers.


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18

(a) How does the human body respond when vaccine is introduced into it?

(b) It is said that vaccinations are a must for a healthy society. Justify.


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Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.

OR


Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.


 6

State the importance of emasculation and bagging in carrying out artificial hybridization.

 7

Mention the causes of chromosomal disorders in humans. How do these disorders occur?