When pollen grains are transferred from the anther to the stigma of flowers of same species of a separate plant is called cross-pollination.
Pollination occurs between two flowers having a difference in genotype. Thus the seed that is produced from this has variation in genotype. Therefore the new plant grown from this seed is not identical with the mother plant. New variation may produce even a new species. Due to combinations of the most plants, their adaptability increase so natural calamity (disaster) can’t extinct them easily.
Merits of cross-pollination:
- Combination of new character occurs.
- New varieties may be originated
- Seeds become more viable and more tolerant.
- Adaptability of new plants increases.
Demerits of Cross – Pollination:
- Depends on the external agent.
- Pollination is uncertain.
- There is a loss of a large amount of pollen
- The purity of species is lost/destroyed