Question
Given below are two statements:
Statement I: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.
Statement II: In phylum Echinodermata, both adults and larvae are radially symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
Solution
Sol. [Key Concept: Body symmetry — evaluating the statements]
When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. The members of the phylum Echinodermata exhibit radial or bilateral symmetry depending on the stage.
Adult echinoderms are radially symmetrical while larval echinoderms are bilaterally symmetrical.
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