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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following is not an example of a hydrostatic skeletal structure?

a. the tube feet of sea urchins

b. the body wall of annelids

c. the mantle of squids

d. the body wall of cnidarians

e. the penis of mammals

Summary Introduction

Introduction:

A hydrostatic skeleton is a form of support structure for an animal body or part of a body through a flexible structure, consisting of muscles and fluids (incompressible liquids such as water or other body fluids). It is a primary support system for invertebrates such as cnidarians, annelids, flatworms, and roundworms, but is found in certain body organs of vertebrates also.

Explanation

Justification for the correct answer:

Option (c) states that the mantle of squids is not an example of a hydrostatic skeleton. This is a true statement because the mantle of a squid is mainly a respiratory and excretory organ and not a body-support organ. Hence, the option (c) is correct.

Justification for the incorrect answers:

Option (a) states that the tube feet of sea urchins are not an example of a hydrostatic skeletal structure. A sea urchin is an echinoderm with hydrostatic skeleton as its primary support system. The tube feet in echinoderms mainly function as a locomotive organ in addition to feeding and respiration and works through the hydraulic pressure system. So, it is an incorrect option.

Option (b) states that the body wall of annelids is not an example of a hydrostatic skeletal structure. This is an incorrect statement as most annelids have a fluid-filled cavity between their outer body wall and gut, referred to as a coelom...

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