Radial symmetry is observed in which of the following phyla?
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Correct answer: Coelenterata, Ctenophora and Echinodermata
Radial symmetry—where any plane through the central axis divides the body into equal halves—is characteristic of Coelenterata (Cnidarians), Ctenophora, and adult Echinodermata. These groups lack distinct left and right sides, unlike bilaterally symmetrical animals.
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More Basis of Animal Classification questions
- When the body can be divided into identical left and right halves in only one plane, the symmetry is called:
- The body cavity which is lined by mesoderm is called:
- In some animals, the body cavity is not lined by mesoderm; instead, the mesoderm is present as scattered pouches. This is known as:
- Which of the following phyla is characterized by the absence of a body cavity (acoelomate condition)?
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