Which one of the following statements is not true?

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Tapetum helps in the dehiscence of anther.

Exine of pollen grains is made up of sporopollenin

Stored pollen in liquid nitrogen can be used in the crop breeding programmes.

Pollen grains of many species cause severe allergies.

answer is C.

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Detailed Solution

Tapetum does not help in dehiscence of anther. It helps in providing nourishment to the microsporogenous tissue and it is involved in formation or sporopollenin and pollenkitt of exine. Endothecium and epidermis are involved in dehiscence of anther.
(1) Pollen grains of many species cause allergies and bronchial afflictions. Example: Parthenium
(2) Pollen is stored in liquid nitrogen at -196⁰C to use them in breeding programmes.
(4) Exine of pollen grain is usually made of sporopollenin.

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