Radial symmetry is primarily observed in which of the following phyla?

Practice MCQ for SSC, UPSC, RRB Exams

A. Annelida and Arthropoda A.
B. Cnidaria and Echinodermata (adults) B.
C. Platyhelminthes and Nematoda C.
D. Mollusca and Chordata D.

Correct Answer: B সঠিক উত্তর: B

Explanation ব্যাখ্যা

Radial symmetry means that the body can be divided into two similar halves by any plane passing through the central axis. This type of symmetry is characteristic of Cnidaria (e.g., jellyfish, Hydra). In Echinodermata (e.g., starfish, sea urchins), adults show pentamerous radial symmetry, although their larvae are bilaterally symmetrical.

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