A) endothecium of anther
B) tapetum of anther
C) inline of pollen grain
D) exine of pollen grain
Correct Answer: D
Solution :
The outer layer of pollen grain is called exine. If is made up of sporopollenin (derived from carotenoid). It is thick and ornamented. Sporopollenin is resistant to physical and biological decomposition. So, pollen wall is preserved for long periods in fossil deposits.
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