AP BIOLOGY

Detailed explanation-1: -Pollination is simply the transfer of pollen grains from an anther to a stigma. Fertilization occurs much later when the pollen grains germinate on the stigma and send down a pollen tube which releases the sex cells to fertilize the ovules.

Detailed explanation-2: -The transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant is called geitonogamy. This transfer involves an agent of pollination.

Detailed explanation-3: -Anemophilous: Anemophilous pollination is a form of pollination where pollen grains are distributed via wind. In all wind-pollinated flowers, the mature stigma is found rough and sticky.

Detailed explanation-4: -When the pollen grain lands on the stigma, chemical communication occurs between the pollen grain and the pistil, helping the pistil recognize the right type of pollen. After acceptance, pollen begins to germinate and the pollen tube develops towards the ovary carrying the male gamete.

Detailed explanation-5: -Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower or another flower on the same plant. Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.