First slide

Pre-fertilisation : Structures and Events

Question

Which among the following plants guarantee assured seed setting even in absence of pollinators?

Easy

A

Plants exhibiting dioecy
B

Plants having unisexual flowers
C

Plants having cleistogamous flowers
D

Plants having flowers exhibiting self incompatibility.

Solution

Cleistogamous flowers do not open at all. In such flowers, the anthers and stigma lie close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. Thus, cleistogamous flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma. Cleistogamous flowers produce assured seed-set even in the absence of pollinators.

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