Question

describe the structure of pollen grain and the process of its germination ​

Answer 1

Pollen germination starts with the pollen grain landing on stigma. The cell of the pollen grain divides into two cells- one of these is smaller in size and called generative cell and bigger one is called tube cell. The intine grows out through the germ pore and form pollen tube.

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Answer 2

Pollen grains are generally spherical in structure about 25-59 mm in dm each pollsn grain is covered by a thick wall having two layers exine and intine
1.exine : is outer thick and tough sculptured a layer often with spinous outgrowths . It is made up of sporopollenin . It enable the pollen grains to survive in unfavourable conditions like high-temperature strong acids and alkalis for a long time, maybe millions of years.. The pollen grains are well preserved as fossils because of the presence of sporopollenin
2. Intine : This is a thin and smooth layer in our to exine . It is a continuous layer made up of Celulose and pectin. Being thin it gives rise to pollen tube at the time pollen germination