Question

how many meiotic division js required for the formation of 200 seeds of gram?

Answer 1

100.................

Answer 2

For producing x number of seeds (or say zygote) x number of egg cells must fuse with x number of male gametes. In angiosperms, 1 meiotic division of Megaspore mother cell leads to formation of one egg cell. So x egg cells are formed from x number of meiotic division. But 1 meiotic division of Sperm mother cell (2n) leads to formation off 4 haploid cells (male gametes).

So by Unitary method,

4 functional male gametes are formed from 1 Meiotic division. x functional male gametes are formed from 1/4 x Meiotic divisions. So total number of meiosis needed to produce x seeds = x + x/4. So 160 meiotic divisions will form 200 seeds