NEET BIOLOGY

Detailed explanation-1: -Immediately after pollination, i.e., when the pollen grains reach stigma, a pollen tube arises from each pollen grain. Each pollen tube carries the male gametes. The pollen tube elongates and grows through the style to reach the ovary where the ovule is present.

Detailed explanation-2: -A pollen grain on the stigma grows a tiny tube, all the way down the style to the ovary. This pollen tube carries a male gamete to meet a female gamete in an ovule.

Detailed explanation-3: -The middle part of the pistil is called style. It is a tube which connects the stigma to ovary. It allows pollen grains to go down to the ovary.

Detailed explanation-4: -The stigma is the sticky surface at the top of the pistil; it traps and holds the pollen. The style is the tube-like structure that holds up the stigma. The style leads down to the ovary that contains the ovules.

Detailed explanation-5: -The pollen tube acts as a conduit to transport the male gamete cells from the pollen grain-either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.