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IB Biology Exam Prep

Category - Biology

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Which of the following characteristics of vertebrates is a necessary consequence of being bilaterally symmetrical?

A true body cavity.
An endoderm layer.
An interior skeleton.
A right and a left side.

Explanation

Correct Response: D. Bilateral symmetry indicates that the organism can be divided down a central axis, each side being a mirror image of the other, with right and left sides. Vertebrates are coelomates, having a true body cavity (A), but this is not a consequence of being bilaterally symmetrical. Vertebrates have an endodermal layer (B), but so do echinoderms, which are not bilaterally symmetrical as adults. Some bilateral organisms, such as flatworms, do not have an interior skeleton (C).

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