Question

How does the pollen mother cell develop into a mature pollen grain? Illustrate the stages with labeled diagrams.

Answer 1

Hint: The outer component of the pollen is the exine, a complex polysaccharide consisting of sporopollenin. There are two cells inside the pollen which constitute the male gametophyte.

Complete Answer:
- The primary cell of male gametophyte is microspore, or pollen grain. It is haploid and unicellular.
- The tube cell is also called the nucleus of the plant and grows into a stream of pollen. The germ cell divides for the development of two sperm cells by mitosis.
- The germ cell division can arise before or after pollination. Young anther is a mass of parenchymatous cells that are enclosed by the epidermis. Then it appears 4 lobes.
-Any of the hypodermal cells in each of the four lobes begin to play as archesporial initials. Initial archesporial break into an external primary parietal cell and a primary inner sporophyte.
- The principal parietal cell divides into 3-5 layers of stone. The main cell for sporogenesis separates into a pool of sporogenous cells called microsporocytes.
-For haploid or pollen grains, the microspore mother cell divides mitotically, and stays organized in the tetrads.

Note: In the stamen, pollen grains produce and consist of a filament that supports the anther. The vascular bundles in the filament administered nutrition from the anther to the mother plant.