First slide

Pre-fertilisation : Structures and Events

Question

A typical angiospermic embryo sac, at maturity is

Easy

A

8-nucleate and 7-celled
B

7-nucleate and 8-celled
C

7-celled and 7-nucleate
D

8-celled and 8-nucleate

Solution

There is a characteristic distribution of the cells within the embryo sac of angiosperms. Three cells grouped at micropylar end is egg-apparatus, three cells are at the chalazal end called antipodals and the large central cell has two polar nuclei, making it 8-nulceate but 7-celled. Monosporic, Polygonum type embryo sac is typical in angiosperms.

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