Question

difference between bisexual and unisexual flowers

Answer 1

Bisexual flowers - Flowers with both male and female organs (also known as complete flowers or hermophrodites)  are known as bisexual flowers.
Unisexual flowers - Flowers with only one sex organs (also known as incomplete flowers) are known as unisexual flowers.

Answer 2

Unisexula flowers - they may have stamen and carpel Bisexual - have both stamen as well as carpel