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Explain the structure of matured pollen ...

 Explain the structure of matured pollen grain.

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(1) When the pollen grain is matured it contains two cells, the vegetative cell and generative cell.
(2) The vegetative cell is bigger, has abundant food reserve and a large irregularly shaped nucleus.
(3) The generative cell is small and floats in the cytoplasm of the vegetative cell. It is spindle shaped with dense cytoplasm and a nucleus.
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