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  • (a) Where does microsporogenesis occur in an angiosperm? Describe the process of microsporogenesis. (b) Draw a labelled diagram of the two-celled male gametophyte of an angiosperm. How is the three-celled male gametophyte different from it ?

(a) Where does microsporogenesis occur in an angiosperm? Describe the process of microsporogenesis.

(b) Draw a labelled diagram of the two-celled male gametophyte of an angiosperm. How is the three-celled male gametophyte different from it ?

 

Answers (1)

a) The megasporogenesis occurs in the nucellus (towards the micropylar end).

The process of formation of megaspores from the megaspore mother cell is called megasporogenesis. Ovules generally differentiate a single megaspore mother cell (MMC) in the micropylar region. of the nucellus. It is a large cell containing dense cytoplasm and a prominent nucleus. The MMC undergoes meiotic division. Meiosis results in the production of four megaspores. In a majority of flowering plants, one of the megaspores is functional while the other three degenerate.

b)

The three celled male gametophytes has one vegetative cell and two male gametes and no generative cell.

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Safeer PP

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