First slide

Pre-fertilisation : Structures and Events

Question

For the formation of 20 microspores and 20 functional megaspores how many meiosis are required?

Moderate

A

20 and 20 respectively
B

5 and 20 respectively
C

10 and 20 respectively
D

20 and 5 respectively

Solution

1 micropore mother cell undergoes meiosis to form 4 haploid microspores.
20 microspore formation requires 20/4=5 meiosis
1 megaspore mother cell produces 1functional megaspore by meiosis
Therefore, for formation of 20 functional megaspores 20 meiosis will be required.

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