First slide

Pre-fertilisation : Structures and Events

Question

The pollen tube enters the ovule though ‘A' and it enters into embryo sac through ‘B’

Easy

A

A-micropyle only, B- micropyle only
B

A-chalaza only, B- micropyle only
C

A- either chalaza or integuments only, B- antipodals only
D

A- chalaza, micropyle or integuments, B-micropylar region of enbryo sac

Solution

The pollen tube can enter the ovule through chalaza or micropyle or integuments and it enters into the embryo sac through micropylar region only. The synergids with filiform apparati that guide the pollen tube into the embryo sac are present at the micropylar region of embryo sac.

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