Majority of the pteridophytes areI. Homosporous and produce only one kind of spores. II. Aquatic in nature. III. Heterosporus and produce small and large spores. IV. Restricted to narrow geographical zone because of specific requirement of water.

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I and II

II and III

III and IV

IV and I

answer is D.

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Detailed Solution

Pteridophytes are mostly homosporous except few. They grow in damp, moist and marshy areas and need water for fertilization.

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