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Question

Radial symmetry is not found in:

A
Hydra
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B
Starfish
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C
Spider
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D
Sea anemone
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Solution

The correct option is C Spider
  • Radial symmetry refers to the arrangement of parts of organisms around a single axis that can be divided into equal halves across any plane.
  • This type of symmetry is seen in some sessile aquatic animals.
  • Animals of the phyla Cnidaria (Hydra) and Echinodermata (starfish) show radial type of symmetry.
  • Spider belongs to phylum Arthropoda which shows bilateral symmetry.
  • Thus, the correct answer is option C.

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