Name: Post Fertilization Events
Uploaded: 2019-07-19
Duration: 1 min 34 s
Description: This video discusses one of the essential concepts of the Human Reproductive System: Post-fertilization events. It stresses that post the fusion of the male and female gamete, the zygote formed undergoes mitotic division and develops into a blastocyst followed by an embryo and foetus.

Question

Explain the stages involved in the maturation of microspore into male gametophyte.

Accepted Answer

Prior to pollination, the nucleus of the pollen grain divides asymmetrically to form two daughter nuclei, of which the larger one is called the tube nucleus and the smaller one is called the generative nucleus. Intine grows to form a small tubular structure called the pollen tube as soon as the pollen germinates on reaching the stigma of the gynoecium. The growth of the pollen tube is influenced by the sugary substance secreted by the stigma, whereby the pollen tube pierces the stigma and makes its way down the style and the wall of the ovary carrying the two nuclei with it.

The tube nucleus lies at the tip of the pollen tube and the generative nucleus lies just behind it. Next, the generative nucleus divides to form two male gametes. The pollen tube next pierces through the nucellus tissue and comes in contact with synergids. Due to the degeneration of synergies, the pollen tube enters within the embryo sac. Ultimately the tip of the pollen tube bursts liberating the two male gametes within the embryo sac.

Explain the stages involved in the maturation of microspore into male gametophyte.

Important Questions on Reproduction in Lower and Higher Plants

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