In sexual reproduction in plants, the pollen (male sex cell) must be transferred to the female part which is the carpel.
It must land on the stigma of the carpel. The process is called pollination.
The plant must adapt to attain that condition needed for pollination to take place. Let us consider the characteristic features of a plant with a flower that uses insect as agent of pollination. These agents of pollination are the insect and wind.