NEET BIOLOGY

Detailed explanation-1: -In pollination, compatible pollen grains land on the stigma and then germinate, forming a pollen tube. The pollen tube grows down through the tissue of the style to deposit sperm for the fertilization of the ovules in the ovary.

Detailed explanation-2: -Once the pollen grains are deposited on the stigma, it starts to germinate with the absorption of nutrients and water. A small pollen tube is produced through the style to the ovary. The tube cell moves out of the pollen grain and through one of the germ pores forms a pollen tube.

Detailed explanation-3: -The stigma is located in the gynoecium of the flower. Its main function is to attract the pollen grains from the air with its sticky tip for reproduction to take place.

Detailed explanation-4: -The pollen tube helps to transport male gametes toward the female gametes. The tube grows along the entire length of the pistil. The germ cell travels down to the tube to the ovary. When the germ cell comes in contact with the eggs cell fertilization occurs.

Detailed explanation-5: -The stigma receives pollen and it is on the stigma that the pollen grain germinates. Often sticky, the stigma is adapted in various ways to catch and trap pollen with various hairs, flaps, or sculpturings.