Multiple Choice
One of the primary developmental/anatomical characteristics distinguishing the major animal phyla is the condition of the body cavity. A pseudocoelomate animal is one in which the body cavity is __________.
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30. Overview of Animals
Overview of Animals
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An animal with a true coelom that has __________ cleavage must be a(n) __________.
A
radial; protostome
B
spiral; deuterostome
C
spiral; endostome
D
All of the listed responses are correct.
E
radial; deuterostome
Verified step by step guidance1
Understand the terms: A 'true coelom' is a body cavity completely lined with mesoderm. 'Cleavage' refers to the pattern of cell division in early embryonic development.
Identify the types of cleavage: 'Radial cleavage' is characteristic of deuterostomes, where cells divide parallel or perpendicular to the axis of the embryo. 'Spiral cleavage' is typical of protostomes, where cells divide at oblique angles.
Recognize the difference between protostomes and deuterostomes: In protostomes, the mouth develops from the first opening (blastopore), while in deuterostomes, the anus develops from the blastopore.
Match the cleavage type with the correct group: Radial cleavage is associated with deuterostomes, and spiral cleavage is associated with protostomes.
Conclude that an animal with a true coelom and radial cleavage must be a deuterostome, as this matches the characteristics of deuterostomes.
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