In papaya,male and female flowers are present on different plants. This condition permits:

Given below are two statements:
Statement $I$: In heteromorphic flowers,pollen grains produced from anther pollinate stigmas produced at same level.
Statement $II$: In Tobacco,the germination of pollen on the stigma of the same flower is inhibited.
In the light of above statements,select the correct option given below:

Give scientific reasons: Outbreeding devices increase fertility.

In monoecious plants like castor and maize:

What is self-incompatibility?

Dichogamy,which helps in cross-pollination,is a floral mechanism in which: