First slide

Pre-fertilisation : Structures and Events

Question

A dioecious flowering plant prevents both

Easy

A

Autogamy and geitonogamy
B

Geitonogamy and xenogamy
C

Cleistogamy and xenogamy
D

Autogamy and xenogamy.

Solution

Dioecious plant means plant with either type of flowers pistillate or staminate means male plant or female plant. For autogamy flowers should be bisexual while for geitonogamy either unisexual flowers of both type should be present on same plant or flowers should be bisexual. So in dioecious plants neither autogamy nor geitonogamy is possible.

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