IPA: /ˌhɛtəˈrɒspəri/
KK: /hɛtəˈrɒspəri/
The state of producing two different types of spores, typically microspores and megaspores, which is common in certain plants.
Heterospory is an important adaptation in the evolution of seed plants.
Heterospory → It is formed from "hetero-" (from Greek "heteros", meaning different) and "spora" (from Greek "spora", meaning seed or sowing). The word refers to the production of different types of spores by a single plant species.
Think of 'different' ('hetero-') types of 'seeds' ('spora') being produced by a plant — that's what heterospory means.
No commonly confused words.