NEET BIOLOGY

Detailed explanation-1: -How does a male gametophyte develop? The pollen grains are released from the pollen-sacs at the two-celled stage. The generative cell further divides to form two male gametes. These male gametes are released into the embryo sac to undergo fusion with the egg and the central cell.

Detailed explanation-2: -Male gametophyte development is often divided into two major phases, an early phase that comprises microspore and bicellular pollen, and a late phase including tricellular and mature pollen. Differences between these stages are reflected in their transcriptomic profiles.

Detailed explanation-3: -The highly reduced male gametophyte of angiosperm plants is a two-or three-celled pollen grain. Its task is the production of two male gametes and their transport to the female gametophyte, the embryo sac, where double fertilization takes place.

Detailed explanation-4: -In flowering plants, male and female gametes are produced in the anther and ovule, respectively. Male gametes are contained within pollen grains, which are released from the anthers at anthesis.