Class NEET 2026 ALL Q #2010
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Which of the following is not a characteristic of chordates?
(A) Presence of post anal part (tail)
(B) Presence of notochord
(C) Central nervous system is dorsal
(D) Absence of gills
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Correct Answer: D

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Detailed Solution

Step 1: Identify Fundamental Chordate Characteristics

According to the NCERT Biology curriculum for Animal Kingdom, chordates are defined by four primary features: 1) Presence of a notochord, 2) A dorsal, hollow, single central nervous system, 3) Paired pharyngeal gill slits, and 4) A post-anal tail.

Step 2: Evaluate the Options

Option (A) is a characteristic (post-anal tail). Option (B) is a characteristic (notochord). Option (C) is a characteristic (dorsal CNS). Option (D) states "Absence of gills". However, chordates are characterized by the presence of pharyngeal gill slits at some stage of their life cycle.

Step 3: Conclusion

Since the presence of pharyngeal gill slits is a diagnostic feature of chordates, the statement claiming their absence is incorrect and therefore represents the correct answer to the question.

Final Answer: D

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must recall specific biological definitions and apply them to identify the exception among the provided options.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific, fundamental biological facts regarding the classification of Phylum Chordata as outlined in the NEET syllabus.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE (Textbook). This question directly assesses the student's grasp of the core diagnostic features of chordates as presented in the NCERT Biology textbook.
||KEY:D

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