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  • Heterospory, i.e., the formation of two types of spores – microspores and megaspores are a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes.

Heterospory, i.e., the formation of two types of spores – microspores and megaspores is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in the plant kingdom?

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Yes, heterospory has evolutionary significance in plant kingdoms. It is the formation of two types of spores differentiating in size and sex, microspores, and megaspores. Microspores are the males who are smaller in size, and megaspores are the larger females. In Pteridophytes, the microspores and megaspores sprout together to give rise to male and female gametophytes. In the end, the zygote matures in the female gametophyte.

This is similar to the seed habit. Seeds make it possible for gymnosperms and angiosperms to survive long periods of hostile conditions. Seeds have also made it possible for them to spread to a different geographical area by seed dispersal.

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