First slide

Pre-fertilisation : Structures and Events

Question

Statement A: An ovule usually has a single embryo sac.
Statement B: In each ovule only one megaspore is usually formed due to reduction division in megaspore mother cell.

Easy

A

Statement A is correct and B is incorrect
B

Statements A and B are correct.
C

Statements A and B are incorrect
D

Statement A is incorrect and B is correct

Solution

Each ovule usually has single embryo sac formed from a functional megaspore. In each ovule usually only one megaspore mother is differentiated from its nucellus. It undergoes reduction division and forms four haploid megaspores. Out of these, three perish and only one is functional. The functional megaspore forms the embryo sac within the nucellus of ovule.

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