Q.

Distribution of pteridophytes is limited to narrow geographical regions on this planet because-

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a

The gametophytes survive in cool damp shady places and water is needed for fertilisation

b

The sporophytes can not survive in light exposed regions

c

Sporophytes require water for spore dispersal

d

Sporophytes have reduced size compared to gametophytes

answer is A.

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Detailed Solution

Since the gametophytes of pteridophytes do not have vascular tissues and they have only unicellular rhizoids they can not survive in non-moist light exposed areas. They also requires water for fertilization.
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