Heteropory, i.e., 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 spermatophtes. Do you think heterospory has some evolutionary significance in plant kingdom?

Explanation

Due to formation of two types of spores following modification in life cycle occur:
(i) Reduction in gametophytic phase
(ii) In situ germination of spores
(iii) Retention of megagametophyte in megasporangium.
Heterospory helps in highly developed seed formation thus having evolutionary significance .