Chapter 25.4, Problem 1NV

Summary Introduction

To compare:

The terms crop, setae, gizzard, and clitellum.

Explanation of Solution

A crop is an organ where the food passes when it leaves the esophagus. It is present in the alimentary canal of the roundworms.

Setae in annelids are bristle-like structures that are present on the body of organisms. It helps in preventing the backsliding of the organism at the time of the peristaltic movement.

A gizzard is present after crops in the earthworm. The gizzard helps in the mechanical breakdown of the food material.

The clitellum is a ring or saddle-like structure that is found in the skin of the worm and generally, the pigment is light there. It is the reproductive structure that contains its egg.