If the two fusing gametes belong to the come present in case of thalloid organisms then such organisms are called homothallic .
When these gametes belongs to different parent then the organism is called as heterothallic .
In angiosperm if male and female sex organs occur in same flower then the plants are called as bisexual .
If flowers possess only one sex organs then the plant is called as unisexual .
When male flower and female flower are present in same plant body plants are called as monoecious .
If they are present in separate plant body then the plants are called dioecious.
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