Protoandry and Protogyny are examples of
Dichogamy
Heterostyly
Herkogamy
Cross pollination
Protoandry refers to the maturation of stamen earlier than pistil and Protogyny is vice versa and both of them areexamples of dichogamy.
When some plants produce more than one type of flowers the phenomenon called as a) herkogamy b)dichogamy c) heterostyly d) homogamy