Class NEET 2026 ALL Q #2034
COMPETENCY BASED
ANALYZE
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
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:
(A) Statement I is incorrect but Statement II is correct
(B) Both Statement I and Statement II are correct
(C) Both Statement I and Statement II are incorrect
(D) Statement I is correct but Statement II is incorrect
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Correct Answer: D

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Detailed Solution

Step 1: Analyze Statement I

Radial symmetry is defined as a condition where any plane passing through the central axis of the body divides the organism into two identical halves. This is a standard definition provided in the NCERT Biology textbook for Class 11 (Animal Kingdom). Therefore, Statement I is correct.

Step 2: Analyze Statement II

In the phylum Echinodermata, the adult forms exhibit radial symmetry (specifically pentamerous radial symmetry). However, the larval stages of echinoderms are bilaterally symmetrical. Since the statement claims that both adults and larvae are radially symmetrical, it is factually incorrect.

Step 3: Conclusion

Since Statement I is correct and Statement II is incorrect, the appropriate option is (D).

Final Answer: Statement I is correct but Statement II is incorrect

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Pedagogical Audit
Bloom's Analysis: This is an ANALYZE question because the student must evaluate the validity of two distinct biological claims based on their understanding of animal classification and developmental biology.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of biological principles (symmetry) rather than mere rote memorization of facts.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. This question format is frequently used by the NTA to test the depth of conceptual clarity regarding the Animal Kingdom chapter.

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