AP BIOLOGY

Detailed explanation-1: -From the anther the pollen grains are first deposited on the pistil’s surface, the stigma . There they germinate and form pollen tubes, which grow downward through the style toward the ovules .

Detailed explanation-2: -The top of the pistil is called the stigma, which is a sticky surface receptive to pollen. The bottom of the pistil contains the ovary and the narrowed region in between is called the style.

Detailed explanation-3: -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-4: -Pollen-tube pathway During the pollination process of higher plants, after the pollen germinates on the stigmatic surface, a pollen tube is formed from the pollen and extends down the style into the ovule; nuclei from the pollen travels through the pollen tube to fertilize the ovule.

Detailed explanation-5: -ovary, in botany, enlarged basal portion of the pistil, the female organ of a flower. The ovary contains ovules, which develop into seeds upon fertilization.