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Endothecium, Tapetum, Epidermis ,Middle ...

Endothecium, Tapetum, Epidermis ,Middle layers. These are the parts of anther wall .
(a ). Arrange them in an order according to occurrence in the anther wall .
(b) What is the function of tapetum ?

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(a). Epidermis endothecium middle layers tapetum.
It becomes the nutritive tissue for developing pollen grains .
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