Define:

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

1. Pollination is the process of transfer of pollen grain from the anther to 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 of anther and stigma.
4. Emasculation is the process of removal of anther in young flower for ensuring artificial pollination.
5. The process of fusion or union of the nuclei of male and female gametes is called fertilisation.