First slide

Pre-fertilisation : Structures and Events

Question

Polygonum type of embryo sac is :

Easy

A

7-celled, 8-nucleated structure
B

8-celled, 8-nucleated structure
C

6-celled, 8-nucleated structure
D

6-celled, 6-nucleated structure.

Solution

The eight nucleated and seven celled embryo sac which is formed from by three generations of free nuclear mitotic division of the functional megaspore. This type of embryo sac is known as "polygonum type" because it was discovered by Strasburger in Polygonum plant.

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