Long question 7 marks. Describe the process, development of Male gametophyte in flowering plants ?

Androecium:

Androecium is the third whorl, which is the male reproductive part of the flower.

Unit:

Its units are called stamen.

Stamen:

Each stamen has a thread like filament at the free end of which anther is attached.

Anther:

Anther has pollen sacs in which haploid microspores (pollen grains) are produced through meiosis.

Process:

Each microspore germinates into the male gametophyte generation. During it, the nucleus of microspore undergoes mitosis ans produces two nuclei i.e. a tube nucleus and a generative nucleus. The generative nucleus again undergoes mitosis and produces two sperms. So, a germinated microspore has a tube nucleus and two sperms. All these structures are the male gametophyte generation of the plant.