Assertion : Insects visit flower to gather honey.
Reason : Attraction of flowers prevents the insects from damaging other parts of the plant.

What is indicated by $'A'$ and $'B'$ in the given diagram?

Assertion : Chasmogamous flowers require pollinating agents.
Reason : Cleistogamous flowers do not expose their sex organs

This is the only type of pollination which during pollination brings genetically different types of pollen grains of the stigma.