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Question

Assertion (A): Developed male gametophytes of angiosperms have 3 cells
Reason (R): In all angiosperms, the male gametophyte has only two male gametes

A
Both A and R are true and R is the correct explanation of A
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B
A is true but R is false
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C
Both A and R are true and R is not the correct explanation of A
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D
Both A and R are false
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Solution

The correct option is C Both A and R are true and R is not the correct explanation of A
A developed male gametophyte i.e. pollen grain has two cells - the vegetative cell with abundant food reserve and the generative cell that floats in the cytoplasm of the vegetative cell.

In 60% of angiosperms, pollen grains shed from the anther after this stage (2-celled stage).

In the remaining species, the generative cell divides (mitosis) to form two male gametes after which the pollen grain sheds (3-celled stage).

Hence, assertion and reason are true but, reason is not the correct explanation of the assertion.

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