Define:

1. Pollination
2. Herkogamy
3. Cleistogamy
4. Emasculation
5. Fertilization

1. Pollination is the process of transfer of pollen grains from the anther to the stigma.
2. Herkogamy is the condition of flower favouring cross-pollination, in which a structural barrier around the stigma prevents self-pollination.
3. Cleistogamy is a condition favouring self-pollination, in which the flower remains closed even at maturity, and the anthers and stigma remain hidden close to each other.
4. Emasculation is the process of removal of anthers from a young flower for ensuring artificial pollination.
5. The process of fusion or union of the nuclei of male and female gametes is called fertilisation.