Phylum Annelida WKS Questions

Name the three embryonic tissue layers.

Ectoderm, Endoderm, Mesoderm

A coelom must be lined on all sides by which of these embryonic tissue layers during development?

Mesoderm

What is the function of the muscles in the epithelium?

Move food through the body

What is the special role of blood vessels within the intestinal walls?

Help absorb food and nutrients

What is the evolutionary advantage of having typhlosole?

Increases the surface area of intestines, allowing for more food absorption.

From which embryonic tissue layer is the peritoneum derived?

Mesoderm

What effect would the contraction of circular muscles have on the worm?

Make it longer, narrower

What effect would the contraction of the longitudinal muscles have on the worm?

Make it shorter, wider

What role does the coelom play in the locomotion of the worm?

Acts as hydrostatic skeleton which provided pressure for muscles to contract

What role do the setae play in the process of locomotion?

The setae allow the worm to glide more easily

How does segmentation play a role in the process of locomotion?

Allows for controlled movement

Why would the ability to store food be advantageous for worms?

Allows them to survive underground for longer periods of time

Why is complex circulatory system advantageous?

The segments allow the movement of oxygen and nutrients to be more efficient