In a bisexual flower,if androecium and gynoecium mature at different times,the phenomenon is known as a

Explain what are outbreeding devices. Give its importance.

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:

When male and female flowers are produced on different plants in a species,the condition is called:

...... prevents both autogamy and geitonogamy.

This is a genetic mechanism that prevents self-pollination by inhibiting pollen germination or pollen tube growth in the pistil,thereby preventing fertilization.