Question

Radial symmetry is not found in:

• A. Hydra
• B. Starfish
• C. Spider
• D. Sea anemone

Answer 1

Answer: (C)

• 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.