Explain outbreeding devices in an easy way
Answers
Unisexuality: In this case, the plant bears either male or female flowers and is not hermaphrodite. It is also called as Dioecism.
Dichogamy: In this mechanism, the stigma and anther mature at different times. Depending on who matures first, dichogamy can be further divided into two:
Protandry: In this type, the androecium matures earlier than the gynoecium. Ex: maize plant
Protogyny: In this type, the gynoecium matures earlier than the androecium.
Herkogamy: This is a name given to a condition where there is a natural physical barrier that prevents the pollen of the same flower from entering the ovary.
Self- Sterility: In this condition, there is a gene that recognizes the similar gene and does not allow the pollen grain to germinate. This is due to the self-sterile gene present in the ovule and the grain.
hope it helps. I've taken help from internet too.