AP BIOLOGY

Detailed explanation-1: -The anther produces pollen (male reproductive cells). The filament holds the anther up. During the process of fertilization, pollen lands on the stigma, a tube grows down the style and enters the ovary.

Detailed explanation-2: -The style is the tube-like structure that supports the stigma. The style leads down to the ovary which contains the ovules. During the process of pollination, pollen moves from the male parts to the female parts. Pollen grains land on the stigma and a tiny tube grows from it and down the style into the ovary.

Detailed explanation-3: -The pollen tube structure rapidly descends down the length of the style via tip-directed growth, reaching rates of 1 cm/h, whilst carrying two non-motile sperm cells. Upon reaching the ovule the pollen tube ruptures, thereby delivering the sperm cells to the female gametophyte.

Detailed explanation-4: -Hint: Pollen tube is a part of the male reproductive organ while the style is carried by the female reproductive organ. Pollen tubes and styles are parts of plants. Both pollen tubes and styles help in the reproduction process.

Detailed explanation-5: -…floral tube, known as the hypanthium, surrounds the ovary either tightly or loosely or is fused to the ovary walls for varying lengths. The rim of the hypanthium bears calyx lobes (free sepals), petals, and either one or two whorls of stamens or numerous stamens.