EVERYDAY SCIENCE

Detailed explanation-1: -The prostomium is the most anterior pre-segmental part of the body to the mouth, which may or may not be retractile and often bears antennae, eyes, tentacles, and palps. The antennae have sensory organs, and the palps may be sensory or can be used as feeding appendages.

Detailed explanation-2: -The prostomium is a lobe that serves as a covering for the mouth and as a wedge to force open cracks in the soil into which the earthworm may crawl 1. The anterior section of the worm is shown in Figure 1. Another key characteristic is the clitellum, or the collar-like structure near the front of worm’s body.

Detailed explanation-3: –Peristomium is the first body segment of earthworm. It carries the mouth.-Setae are bristles like structure that help in anchoring the soil for movement.

Detailed explanation-4: -Function. Prostomium: The prostomium helps to push the body of annelids into the soil.

Detailed explanation-5: -Prostomium is a dorsal lobe which is present on the ventral mouth. Peristomium is the first segment of earthworm with a ventral mouth. It overhangs the mouth of an earthworm. It surrounds the mouth opening. Septal nephridium.