Question

number of spindle apparatus formed during meiosis for the formation of 100 microspores from microsporemother cells is
1. 25
2. 75
3. 50
4. 100

Answer 1

Answer : 75

Explaination : Microspore mother cell undergoes meiosis to produce microspores or pollen grains. 1 Microspore mother cell undergo 1 meiosis and produce 4 pollen grains. To produce 100 microspores -

100÷4=25 meiosis divisions required.

Totally in meiosis 3 spindle fibres are formed ( 1 in meiosis-I and 2 in meiosis I|). So 1 meiosis 3 spindle then for 25 meiosis 25×3=75.