Question

What is the unisexual flower? And such flower self pollinated

Answer 1

Unisexual flower is that flower which only consists of one type of gamete either male or female
there is only cross pollination

Answer 2

The flowers which contain only the male or female reproductive organs are called unisexual flowers.

For example : Papaya flower.

No. These flowers can't be self pollinated because one of the sexual organs are absent in the flower, so it is compulsory for the flower to have cross pollination.