NEET BIOLOGY

Detailed explanation-1: -To be pollinated, pollen must be moved from a stamen to the stigma. When pollen from a plant’s stamen is transferred to that same plant’s stigma, it is called self-pollination. When pollen from a plant’s stamen is transferred to a different plant’s stigma, it is called cross-pollination.

Detailed explanation-2: -During the process of fertilization, pollen lands on the stigma, a tube grows down the style and enters the ovary. Male reproductive cells travel down the tube and join with the ovule, fertilizing it. The fertilized ovule becomes the seed, and the ovary becomes the fruit.

Detailed explanation-3: -Pollination : The mechanism of transferring pollen grains from the anther of one flower to the stigma of another flower of the same or different plant is called pollination. The pollen grains can be transferred to the stigma of the flower through wind, water and insects called pollinating agents.

Detailed explanation-4: -As pollinators reach for the nectar in flowers, they rub against the pollen and it often sticks to them. As they move between flowers, the pollinator brushes off onto other flowers. This is a strategy plants use for pollen to travel and fertilization to occur, since plants are rooted in place.

Detailed explanation-5: -Due to the spatial separation between male and female pollen grains from the anther of most flowering plants, including orchids, pollens are transported by wind or animals and deposited onto the receptive surface of the stigma of a different plant.