Biological Science, Loose-leaf Edition (7th Edition)
Biological Science, Loose-leaf Edition (7th Edition)
7th Edition
ISBN: 9780135272800
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 31, Problem 1TYK
Summary Introduction

Introduction:

The lophotrochozoans are the descendants of one common ancestor. The name lophotrochozoa is because of the morphological traits found in these animals, the lophophore and the trochophore.

Expert Solution & Answer
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Answer to Problem 1TYK

Correct answer:

The lophophore is a structure found in 3 phyla out of the 13 phyla, categorized under the lophotrochozoans. The mouth is ringed by tufts and helps in suspension feeding.

Explanation of Solution

Explanation/Justification for the correct answer:

Option (a) is given as a filter-feeding specialized structure. The lophophore is a structure that helps in suspension feeding and bears tufts. This structure is found in phoronids, bryozoans, and brachiopods. Hence, Option (a) is correct.

Explanation for incorrect answer:

Option (b) is given as a single opening in species with a blind gut. The lophophore is a feeding structure, so it is not a single opening in species. So, it is an incorrect option.

Option (c) is given as a distinctive type of larva with a band of cilia. It is not a particular type of larva as it is only a feeding structure present in the lophotrochozoans. So, it is an incorrect option.

Option (d) is given as a synapomorphy that defines lophotrochozoans. Spiral cleavage in these organisms is a synapomorphy. Lophophore is a feeding structure rather than a synapomorphy. So, it is an incorrect option.

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

Conclusion

The lophophore is present around the mouth as a ring of tentacles, which are ciliated. The food particles present in the water are taken up by the water currents to draw food.

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