Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 24, Problem 1MC
Summary Introduction

Introduction:

The department of the animals under the principal taxonomical classification, which comes between the Kingdom and Class, is Phylum. There are near about ten major phyla in kingdom Animalia.

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Answer to Problem 1MC

Correct answer:

The organisms in the phylum “Cnidaria” are radially symmetrical. Therefore, option (b) is correct.

Option (b) is given as “cnidarians”.

Explanation of Solution

Justify reasons for the correct statement:

The cnidarians are mostly marine animals but some also live in freshwater habitats. The characteristic feature of cnidarians is cnidoblasts “specialized cells” used for catching of prey. Some of the cnidarians are sea anemones and jellyfishes. These animals if divided along a central axis then the subparts will be equal to each other and this type of symmetry is “radial symmetry”.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “arthropods”. The arthropods are bilateral symmetrical because they can be divided into two equal halves when cutting from the medial line. Hence, it is a wrong answer.

Option (c) is given as “mollusks”. The mollusks are bilateral symmetrical because they can be divided into two equal halves when cutting from the medial line. Hence, it is a wrong answer.

Option (d) is given as “roundworms”. The roundworms are bilateral symmetrical because they can be divided into two equal halves when cutting from the medial line. Hence, it is a wrong answer.

Hence, options (a), (c), and (d) are incorrect.

Conclusion

The radial symmetry is exhibited in cnidarians.

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