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In gymnosperms, the female gametophyte forming archegonia provides nourishment to the developing embryo. It later gets transformed into food-laden endosperm inside the seed. Endosperm provides nourishment for growth of seed at the time of seed germination. Triploid endosperm occurs in angiosperms.

1. Transfer of pollen grains by birds is known as ornithophily. They usually have bright coloured flowers, tubular or cup shaped and having a large quantity of nectar.
2. Each microspore mother cell gives rise to 4 microspores which develop into pollen grains.
3. Each microspore mother cell undergoes meiosis to produce four pollen grains. Thus, 25 microspore mother cells are required to produce 100 pollen grains.
4. 200 seeds of pea would be produced from 200 pollen grains and 200 embryo sac. 200 pollen grains will be formed by 50 microspore mother cell while 200 embryo sac will be formed by 200 megaspore mother cell (because 3 will degenerate) so 250/500.

Correct answer: Each microspore mother cell undergoes meiosis to produce four pollen grains. Thus, 25 microspore mother cells are required to produce 100 pollen grains.

Solution

A microspore mother cell undergoes meiosis to form four microspores, and each microspore develops into a pollen grain. So 100 pollen grains require 25 microspore mother cells.

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