MECHANISMS THAT HINDER SELF FERTILIZATION IN PLANTS
Dichogamy: a condition in which the sex organs mature at different times.
This is as follows;protandry which means that the male parts of the plant ie the anthers matures early before the stigma;protogyny which means that the stigma matures early before the anthers are produced hence no fertilization
Self sterility: the pollen grains cannot pollinate its own stigma since they are non compatible
Dioecism: the male and the female reproductive organs are found on separate plants as in the case of the paw paw this instead promote cross pollination.
The stigma may be located above the stamen; hence more exposed to external pollen grains than its own pollen grains. This process is called heterostyl.
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