Pollination of male gametes:
Pollination is a very significant part of the life cycle of a flowering plant. It is an element of the sexual reproduction procedure of flowering plants, which results in seeds that will grow into fresh plants. Plants have gametes, which include half the usual number of chromosomes for that plant species. Male gametes are found inside tiny pollen grains on the anthers of flowers.
The male gametes of angiosperms consist of two sperm cells within a pollen grain or a pollen tube. They are derived from a single generative cell, which is formed as the smaller cell by unequal cell division in the microspore after meiosis.
Male gametes pollination process:
(i) Two nucleated pollen grains are transferred to stigma through pollination
(ii) During this time exine bursts out and
(iii) The intine is extended to form a pollen tube which passes through the germpore and enters the ovule of an ovary.
(iv) The tube nucleus remains at the anterior end while the reproductive nucleus lies behind it.
(v) The reproductive nucleus divides through mitosis division forming two male gametes (n) and the tube nucleus is degenerated.