3
Question
Complete the following flow chart
Pollen mother cell → Pollen tetrad ⟶Pollen grain ⟶vegetative cell and_
Pollen mother cell → Pollen tetrad ⟶Pollen grain ⟶vegetative cell and_
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Solution
Development of male gametophyte
The following events take place during the formation of pollen grains:-
* Pollen mother cells divide by meiosis and produce haploid pollen tetrads or microspore tetrads.
* The tetrads further give rise to four individual microspores.
* The nucleus of the microspores divide by mitosis and produce two daughter cells-one smaller generative cell and one larger vegetative cell. Most of the pollen grains shed off at the 2 celled stage.
Generative cell
Generative cell is a small cell having only a few cellular organelles. It lies freely in the cytoplasm of the vegetative cell. It further divides to give rise to the two male gametes.
Vegetative cell
Vegetative cell is a large cell with a nucleus that is lobed and a cytoplasm with vacuoles.
Final answer
The following events take place during the formation of pollen grains:-
* Pollen mother cells divide by meiosis and produce haploid pollen tetrads or microspore tetrads.
* The tetrads further give rise to four individual microspores.
* The nucleus of the microspores divide by mitosis and produce two daughter cells-one smaller generative cell and one larger vegetative cell. Most of the pollen grains shed off at the 2 celled stage.
Generative cell
Generative cell is a small cell having only a few cellular organelles. It lies freely in the cytoplasm of the vegetative cell. It further divides to give rise to the two male gametes.
Vegetative cell
Vegetative cell is a large cell with a nucleus that is lobed and a cytoplasm with vacuoles.
Final answer
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