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.