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Chapter 33: Q33.3-2CC. (page 703)

Annelid anatomy can be described as "a tube within a tube." Explain.

Short Answer

Expert verified

Annelids are referred to as 'a tube within a tube' because they have an outer tube, the body wall, and an inner tube called the digestive tract.

Step by step solution

01

Annelids

Annelids can be found both in the water and on land. They might be parasitic or free-living. Annelids have unique segments or metameres on their bodies. They have longitudinal and circular muscles that let them move around.

Earthworms and blood-sucking leech are some examples of annelids.

02

Body plan of annelid

The alimentary canal of annelids runs throughout the body's length and is considered the inner tube. Its body wall is like an outer tube. The coelom separates the inner and the outer tubes.

03

Body plan is like 'a tube within a tube'

The body plan of annelids is considered as 'a tube within a tube.’ This is because it has a superficial blanket of cuticle, epidermis, muscles, and an interior covering of the alimentary canal in the coelomic cavity.

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Most popular questions from this chapter

Historically, annelids and arthropods were viewed as closely related because both have body segmentation. Yet DNA sequence data indicate that annelids belong to one clade (Lophotrochozoa) and arthropods to another (Ecdysozoa). Could traditional and molecular hypotheses be tested by studying the Hox genes that control body segmentation (see Concept 21.6)? Explain.

Explain how tapeworms can survive without a coelom,a mouth, a digestive system, or an excretory system.

WHAT IF? Some molecular evidence suggests that the sister group of animals is not the choanoflagellates but rather a group of parasitic protists, Mesomycetozoa. Given that these parasites lack collar cells, can this hypothesis be correct? Explain.

What hypotheses were the researchers testing in this study? What are the independent variables? What are the dependent variables?

In Figure 33.8, assume that the two medusae shown at step 4 were produced by one polyp colony. Review Concept 12.1 and Concept 13.3, and then use your understanding of mitosis and meiosis to evaluate whether the following sentence is true or false; if false, select the answer that provides the correct reason. Although the two medusae are genetically identical, a sperm produced by one will differ genetically from an egg produced by the other.

(A) False (both the medusae and the gametes are genetically identical)

(B) False (neither the medusae nor the gametes are genetically identical)

(C) False (the medusae are not identical but the gametes are)

(D) True
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