Q1 of 805 Page 1

Name the condition in vertebrates where the body attacks self-cells.

The condition in vertebrates where the body attacks self-cells is known as autoimmunity or autoimmune disorder. In this condition, the body fails to distinguish between foreign and self-cells and attacks its own cells.


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22

Highlight the differences between the population interactions given below. Give an example of each.

(a) Parasitism


(b) Amensalism


(c) Mutualism


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(a) Geitonogamy and xenogamy, both require pollinating agents, yet they are very different from each other. Explain how.

(b) Describe the characteristics of flowers that are pollinated by wind.


OR


Explain the process of development of a mature human female gamete from the time it is initiated till the formation of ootid.


 3

A colour blind boy is born to a couple with a normal colour vision. Write the genotype of the parents.

 4

Mention any two conditions that enhance the chances of syngamy in organisms exhibiting external fertilization.