AP BIOLOGY

Detailed explanation-1: -archegonium, the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base-the venter-which contains the egg.

Detailed explanation-2: -The eggs are produced in tiny, typically somewhat flask-like structures called archegonia. Each archegonium holds one egg (in a swollen section called the venter) and the sperm enter through the channel in the narrower, tubular section (or neck).

Detailed explanation-3: -The archegonium matures to produce one egg at the base of the venter cells.

Detailed explanation-4: -Archegonia are typically located on the surface of the plant thallus, although in the hornworts they are embedded.

Detailed explanation-5: -Archegonia in contrast produce a single egg cell located within a chamber known as the venter. A canal to the outside forms within the neck of the venter and breakdown products of cells that degenerate to form this canal generate a signal that serves as a chemoattractant to the sperm cells.