Pre Fertilisation Structures And Events

Step 1: Understanding pollen grain development.
Pollen grains develop from microspores, not megaspores. Microspores are formed through the process of microsporogenesis in the anthers of flowering plants. Step 2: Analysis of other statements.
Option (B): Pollen grains do contain two cells: a generative cell and a tube cell. The generative cell later divides to form two sperm cells. Option (C): Pollen grains are released from the anthers, not the stigma, during pollination. Option (D): Pollen grains play a critical role in the reproductive process by carrying male gametes for fertilization. Step 3: Identifying the incorrect statement.
The statement that pollen grains develop from megaspores is incorrect. Megaspores give rise to the female gametophyte.