Q.187 Zoology ⭐ 360° Option Elimination Active

NEET 2024 Zoology Question 187 Solution

Topic: Animal Kingdom · Official NTA Booklet Code T1

Question

The following are the statements about non-chordates: A. Pharynx is perforated by gill slits. B. Notochord is absent. C. Central nervous system is dorsal. D. Heart is dorsal if present. E. Post anal tail is absent. Choose the most appropriate answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (1) : B, D & E only

📚 Animal Kingdom Medium

📋 Given Parameters & Problem Setup

Target Group Non-chordates (Porifera to Hemichordata)

Candidate Statements A: Pharynx perforated by gill slits; B: Notochord is absent; C: Central nervous system is dorsal; D: Heart is dorsal if present; E: Post anal tail is absent

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The 30-Second Exam Hall Shortcut: ⚡ Chordata vs Non-chordata Table 4.1 Verification

⏱️ Save ~30 seconds

Pharyngeal gill slits (A) and Dorsal CNS (C) are chordate traits (False for non-chordates)! Notochord absent (B), Dorsal heart (D), and Post-anal tail absent (E) are TRUE for non-chordates!

1 Evaluate statements for NON-CHORDATES:

2 - A: Pharynx perforated by gill slits -> CHORDATE trait (gill slits absent in non-chordates) -> FALSE.

3 - B: Notochord is absent -> TRUE for non-chordates.

4 - C: Central nervous system is dorsal -> CHORDATE trait (non-chordate CNS is ventral, solid, and double) -> FALSE.

5 - D: Heart is dorsal (if present) -> TRUE for non-chordates (chordate heart is ventral).

6 - E: Post-anal tail is absent -> TRUE for non-chordates (chordate post-anal tail is present).

7 Valid statements about non-chordates: B, D & E only -> Option (1) / A.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Animal Kingdom (Comparison of Chordates and Non-chordates)

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Review NCERT Table 4.1 (Chordates vs Non-chordates)

1. Notochord: Present in chordates; Absent in non-chordates (Statement B is TRUE). 2. Central Nervous System: In chordates, it is dorsal, hollow, and single. In non-chordates, it is ventral, solid, and double (Statement C is FALSE for non-chordates). 3. Pharyngeal Gill Slits: Present in chordates; Absent in non-chordates (Statement A is FALSE for non-chordates). 4. Heart: Ventral in chordates; Dorsal (if present) in non-chordates (Statement D is TRUE). 5. Post-anal Tail: Present in chordates; Absent in non-chordates (Statement E is TRUE).

Step 2

Filter Statements Applicable to Non-chordates

Statements B, D, and E accurately characterize non-chordates.

Step 3

Match with Options

B, D & E only corresponds to Option (1).

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 (1)

✓ 100% Correct

Verdict & Scientific Reason:

Correctly identifies that non-chordates lack a notochord (B), have a dorsal heart if present (D), and lack a post-anal tail (E).

💡

Why this is airtight: None.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Includes Statement C; non-chordate nervous system is ventral, not dorsal.

⚠️

Student Fallacy (Why candidates pick this trap): Includes Statement C; non-chordate nervous system is ventral, not dorsal.

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Both A and C are diagnostic traits of Chordates, not non-chordates.

⚠️

Student Fallacy (Why candidates pick this trap): Both A and C are diagnostic traits of Chordates, not non-chordates.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Includes Statement A; non-chordates do not possess pharyngeal gill slits.

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Student Fallacy (Why candidates pick this trap): Includes Statement A; non-chordates do not possess pharyngeal gill slits.

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NTA Trap Alert: Dorsal/Ventral Heart and Nerve Cord Inversion

Confusing chordate nerve cord (dorsal) and heart (ventral) with non-chordates (nerve cord ventral, heart dorsal).

🛡️ How to avoid the -1 mark: In non-chordates, everything is inverted: Heart is Dorsal, Nerve Cord is Ventral.

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Core NEET Syllabus Standard

Biology Core Zoology · Animal Kingdom Standard Benchmark

Core Scientific Principle Tested:

"Table 4.1 Comparison of Chordates and Non-chordates: Non-chordates: Notochord absent; CNS is ventral, solid and double; Pharyngeal gill slits absent; Heart is dorsal (if present); Post-anal tail is absent."

Syllabus Focus: Fundamental Distinctions: Chordates vs Non-chordates

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Zoology Question 187 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Chordata vs Non-chordata Table 4.1 Verification

Step-by-Step Rigorous Workflow & Mathematical Proof

Review NCERT Table 4.1 (Chordates vs Non-chordates)

Filter Statements Applicable to Non-chordates

Match with Options

360° Option Elimination Engine Key Feature

NTA Trap Alert: Dorsal/Ventral Heart and Nerve Cord Inversion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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