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?
Heterospory led to in situ embryo development. The embryo derives nutrition from the female gametophyte and is better protected. Heterospory led to the evolution of
seed habit, which helped the plants to flourish and tide over long periods of unfavourable conditions.