Question

How many meiotic divisions are required for formation of 125 seeds of rice?

Answer 1

Answer:

Explanation:

Assuming that you have studied megasporogenesis and microsporogenesis. To produce a seed, you require the production of pollen(n) and egg(n) and their fusion.

Let's start with pollen grain(n):

4 pollen grains are produced after 1 meiotic division in the pollen sacs.

4 pollen grains=1 meiotic division

To produce 1 pollen grain.

1 pollen grain=1/4 meiotic division

For production of x pollen grains.

x pollen grains=x/4 meiotic divisions(1)

Now coming to egg(n):

Only 1 egg is produced after 1 meiotic division in the megasporangium.

1 egg=1 meiotic division

For production of x no. of eggs.

x eggs=x meiotic divisions(2)

For production of x no of seeds(2n):

x pollen grains and eggs are required. No. of meiotic divisions to produce x pollen grains and eggs.

x seeds=x+x/4 meiotic divisions From (1) and (2)