First slide

Pre-fertilisation : Structures and Events

Question

In majority of angiosperms,

Easy

A

egg has a filiform apparatus
B

there are numerous antipodal cells
C

reduction division occurs in the megaspore mother cells
D

a small central cell is present in the embryo sac

Solution

In most of the angiosperms, the megaspore mother cell (2n) divides meiotically i.e., by reductional division to produce 4 cells. Out of these, three degenerate and the remaining one forms the functional megaspore. This further divides mitotically and forms embryo sac.

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