Question

Suppose in a flower of mustard each microsporangium possess 20 pollen mother cells then,the total number of male gamets formed by this flower.

Answer 1

Ans.

A pollen mother cell or microspore mother cell is defined as a diploid plant cell that produces haploid microspores or pollen grains by the process of meiosis. Meiosis involves formation of four daughter cells from one parent cell each having half of the number of chromosomes as present in parent cell. It means, "one pollen mother cell forms four haploid male gametes" as it goes through meiotic cell division during microsporogenesis.

Thus, 'a mustard flower with 20 pollen mother cells will form 80 (20X4= 80) male gametes or microspores.'

 

Answer 2

Pollen grains are spermatozoon in the mustard flower.

The spermatozoon are haploid in nature.

These spermatozoon are responsible for the correct number of chromosome in the zygote during fusion.

Mother cell is subjected to meiosis and process four haploid cells.

So the mustard flower possess 20 pollen mother cells.

Hence it possess 20 x 4 = 80 male gametes.

Hence the total number of spermatozoon possed by mustard flower is 80.