Consider the following statements regarding gymnosperms and choose the correct option.
I. In gymnosperms, the male and female gametophytes have an independent existence.
II. In gymnosperms, the multicellular female gametophyte is retained within the megasporangium.
III. All gymnosperms are heterosporous.
Of these statements

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I and II are true but III is false

I and III are true but II is false

II and III are false but I is true

II and III are true but I is false

answer is D.

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Detailed Solution

In gymnosperms the male and the female gametophytes do not have an independent free-living existence. One of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs. The multicellular female gametophyte is also retained within megasporangium. The gymnosperms are heterosporous; they produce haploid microspores and megaspores.

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