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Standard XII
Biology
Jointed Appendages
Radial symmet...
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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