First slide

Pre-fertilisation : Structures and Events

Question

The embryo sac is produced from the functional megaspore after:

Moderate

A

Cellular Mitosis
B

Free nuclear mitosis
C

Meiosis
D

Formation of a thick-walled resting spore

Solution

We must note that mitotic divisions are strictly free nuclear, that is, nuclear divisions are not followed immediately by cell wall formation. After the 8-nucleate stage, cell walls are laid down leading to the organisation of the typical female gametophyte or embryo sac.

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