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Draw a labelled diagram of the sectional...

Draw a labelled diagram of the sectional view of a mature pollen gram in angiosperms. Explain the functions of its different parts.

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(i) Exine -It can withstand high temperature /strong acids /alkali
(ii) Intine -It is a thin and continuous layer made up of cellulose and pectin. (iii) Vegetative cell -It is bigger, has abundant food reserve. (iv) Generative cell -It divides mitotically to give rise to two male gametes.
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