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An enlarged view of one microsporangium ...

An enlarged view of one microsporangium of a mature anther is given:
(a) Name A, B and C.
(b) Mention the characteristics and functions of the cells forming wall layer C.

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A-Endothecium, B-Middle layers, C-Tapetum. The cells become large, multinucleate and polyploid.
Functions: (a) Nourshing the sporogenous cells and the derivatives.
(b) Secreting hormones, Ubisch granules (for sporopollen and other exine components), pollenkitt and compatibility -incompatibility proteins for pollen grains.
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