Q12 of 49 Page 5

Why do gametes produced in large numbers in organisms exhibit external fertilisation?

Gametes produced in large numbers in organisms exhibit external fertilisation because gametes are released in open environment. Due to which they are constantly exposed to factors like predators, desiccation etc. This leads to reduced number of gametes.

2.Increased number of gametes increases the chances ofsyngamy. Which is the fusion of the male and female gametes. Increased number of gametes increases the probability of syngamy.


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10

Give reasons as to why cell division cannot be a type of reproduction in multicellular organisms.

 11

In the figure given below, mark the ovule and pericarp.


 13

Which of the followings are monoecious and dioecious organisms.

a. Earthworm ______________


b. Chara ______________


c. Marchantia ______________


d. Cockroach _____________


 14

Match the organisms given in Column-’A’ with the vegetative propagules given in column ‘B’.

Col. A Col. B


i. Bryophyllum a) offset


ii. Agave b) eyes


iii. Potato c) leaf buds


iv. Water hyacinth d) bulbils