Identify the correct statement.

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In over 70 percent of angiosperms, pollen grains all shed at 2-celled stage.

In 50% species of angiosperms pollination occurs at 3-celled stage of pollen grain.

Intine of pollen grain is made up of cellulose and lignin.

Pollen grains of a many species cause severe allergies and bronchial afflictions in some people.

answer is D.

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Detailed Solution

In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). Intine of pollen grain is made up of cellulose and pectin. Pollen grains of a many species cause severe allergies and bronchial afflictions in some people.

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