First slide

Pre-fertilisation : Structures and Events

Question

Strategies to prevent self-pollination are
a. dioecy
b. self incompatibility
c. autogamy

Easy

A

only (a)
B

only (c)
C

Both (a) and (b)
D

Both (a) and (c)

Solution

Dioecy and self-incompatibility are the methods to prevent self-pollination in plants. In dioecy, male and female flowers are borne on separate plants. So, that cross-pollination is promoted. In self- incompatibility, pollens are prevented to fertilise the ovules of same flower by inhibiting pollen germination on the pistil.

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