Long Answer Question: Explain the stages involved in the maturation of microspore into male gametophyte. - Biology

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Answer in Brief

Long Answer Question:

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

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Solution


Development of male gametophyte

  1. Pollen grain/microspore marks the beginning of male gametophyte, thus it is the first cell of the male gametophyte.
  2. It undergoes the first mitotic division to produce bigger, naked vegetative cells and small, thin-walled generative cells.
  3. The vegetative cell is rich in food and having an irregularly shaped nucleus.
  4. The generative cell floats in the cytoplasm of the vegetative cells.
  5. The second mitotic division is concerned with generative cells only and gives rise to two non-motile male gametes.
  6. The mitotic division of the generative cells takes place either in the pollen grain or in the pollen tube.
  7. The pollen grains are shed from the anther, at this two-celled stage in most of the angiosperms.
Concept: Pre-fertilization in Plant: Microsporangium
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Chapter 1: Reproduction in Lower and Higher Plants - Exercises [Page 16]

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Balbharati Biology 12th Standard HSC for Maharashtra State Board
Chapter 1 Reproduction in Lower and Higher Plants
Exercises | Q 4.2 | Page 16
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