AP BIOLOGY

Detailed explanation-1: -The body of an earthworm is divided into 100-120 similar segments, i.e. metameres.

Detailed explanation-2: -The body of an earthworm is made up of approximately 100-120 segments. Each segment has muscles and bristles, known as setae, that help in the movement.

Detailed explanation-3: -The earthworm body is divided into ringlike segments (as many as 150 in L. terrestris). Some internal organs, including the excretory organs, are duplicated in each segment. Between segments 32 and 37 is the clitellum, a slightly bulged, discoloured organ that produces a cocoon for enclosing the earthworm’s eggs.

Detailed explanation-4: -The scientific term for the body segments of earthworms are called metameres.

Detailed explanation-5: -Reproductive system In between the 12th and 13th segments, there is a pair of ovaries. Sac-like structures called spermathecae (four pairs) are found in the 6th and 9th segments. These structures receive and store the spermatozoa during copulation.