Biology
Biology
10th Edition
ISBN: 9780321794260
Author: Audesirk, Teresa/ Audesirk
Publisher: Pearson College Div
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Chapter 24, Problem 1FIB
Summary Introduction

Introduction:

The organisms found on the planet are divided into chordates and non chordates on the basis of presence of nerve chord. Chordates include bony animals such as apes, birds human, as well as lancelets (small fishlike creatures).

Expert Solution & Answer
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Answer to Problem 1FIB

Correct answer:

In chordates, the nerve cord is hollow and runs along the dorsal side of the body. During at least one stage of a chordates life, it has a tail that extends past its anus and its body is stiffened by a notochord that runs along its length.

Explanation of Solution

Chordates contain a dorsal nerve cord, a notochord, pharyngeal gill slits and post anal tail. The nerve cord of chordates is found above the digestive tract, running along the upper portion of the body. Nerve cord of chordates is hollow, filed with fluid. In other animals nerve chord is filled with nerve tissues.

Notochord is a hard and rigid rod like structure which extends along the length of the body. It is located between digestive tract and nerve cord and provides support to the body. In many chordates notochord disappears with the development of skeleton.

Post anal tail is posteriorly extended structure that expands past the anus. The tail is made up of tissues and nerve cord. Many chordates contain tail throughout their life while some chordates lose them during development.

Conclusion

Presence of nerve chord is unique feature of all chordates. It is located on the dorsal side of body and provides supports. Tail is made up of tissues and is found in some chordates throughout life while some chordates lose them in the course of development.

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