Name: Apomixis and Polyembryony
Uploaded: 2019-07-19
Duration: 7 min 23 s
Description: Apomixis and polyembryony are unusual forms of reproduction that allow seed formation, for continuity of life, without genetic shuffling. Do you want to know...

Question

Why meiosis is essential at the time of sporogenesis in angiosperms? Explain the process of formation of male gametophyte in angiosperms with suitable diagrams.

Accepted Answer

Sporogenesis s the process of formation of spores. It takes place by the process of meiosis so as to maintain the ploidy level of the zygote and maintain the number of chromosomes in the individual species.

The anther in the male flowers of the angiosperms contains two lobes and each lobe has two pollen sacs or microsporangia. Each microsporangium has many microspore mother cells in it. The pollen sacs produce pollen grains.

Each pollen grain has two cells: large generative cell and one small tube cell.

This pollen grain is transferred to the stigma of the flower. The secretion by the stigma directs the pollen grain and the intine comes out of the pollen grain and the pollen tube formation is initiated. The tube cell has stored food and energy.The tube cell has stored food and energy.

-The tube cell, generative cell and cytoplasm all move to the pollen tube which is directed by the ovary’s chemical stimuli.

This pollen tube consisting of two male gametes and a degenerating tube nucleus represents the male gametophyte.

The process of formation of the male gametophyte has been shown diagrammatically:

Why meiosis is essential at the time of sporogenesis in angiosperms? Explain the process of formation of male gametophyte in angiosperms with suitable diagrams.

Important Questions on Sexual Reproduction in Flowering Plants

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