RE-NEET 2026 Zoology Symmetry Assertion Reason 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 :
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
Correct Answer
Detailed Explanation
Statement I is correct because radial symmetry indeed refers to organisms that can be divided into identical halves by any plane passing through their central axis. However, Statement II is incorrect; while echinoderm larvae exhibit bilateral symmetry, adult echinoderms display radial symmetry.
Thus, the correct answer is B: Statement I is correct but Statement II is incorrect.
The tempting wrong options fail because they either incorrectly assert both statements are true or misinterpret the symmetry characteristics of echinoderms, particularly in adults.
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