describe the structure of a mature pollen grain and draw a labelled diagram of its cell stage

Please find below the solution to the asked query

The mature pollen grain consist of two cells- vegetative cell and generative cell.

Vegetative cell is the large cell with irregular nucleus and contains food reserves. The generative cell lies within the vegetative cell. In mature pollen, both the cells are covered by a thin cellulose cell wall called intine and external tough wall of sporopollenin. called exine. Vegetative cell  performs the metabolic functions, stores reserve food for the pollen grain and delivers the gametes to the embryo sac of the ovule. While the generative cell produces sperm nuclei by mitosis. 

Hope this information will clear your doubts about the topic.

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