"Incompatibility is a natural barrier in the fusion of gametes". Justify the statement.

Explanation

The incompatibility is considered as the most widespread and effective device to prevent inbreeding and promote out breeding . It acts as a natural barrier by the interaction of chemical substances produced by the male gametophyte and the tissue of style. Normally , the functional pollens belonging to right mating type germinate on stigma , develop pollen tube and bring about fertilisation. The pollen grains belonging to other mating types are discarded .