Heterospory is the production of

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(B) Heterospory is a phenomenon in which a plant produces two different types of spores that differ in size and function.These are known as microspore

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Large and small spores

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(B) Heterospory is a phenomenon in which a plant produces two different types of spores that differ in size and function.These are known as microspores (small,male) and megaspores (large,female).This condition is a significant evolutionary step towards the seed habit in plants,commonly observed in Pteridophytes like $Selaginella$ and $Salvinia$.

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