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Which one of the following statements is not true?
A
Exine of pollen grains is made up of sporopollenin.
B
Pollen grains of many species cause severe allergies.
C
Stored pollen in liquid nitrogen can be used in the crop breeding programmes.
D
Tapetum helps in the dehiscence of anther.
Explanation
The tapetum nourishes pollen; the endothecium aids dehiscence.
Detailed Solution
The microsporangium is surrounded by four wall layers: epidermis, endothecium, middle layers and tapetum. The tapetum is the innermost layer, which nourishes the developing pollen grains; it does not help in dehiscence.