Q.194 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 194 Solution

Topic: Animal Kingdom · Official NTA Booklet Code G5

Question

Select the correct statements with reference to chordates. A. Presence of a mid-dorsal, solid and double nerve cord. B. Presence of closed circulatory system. C. Presence of paired pharyngeal gill slits. D. Presence of dorsal heart E. Triploblastic pseudocoelomate animals. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (3) : B and C only

📚 Animal Kingdom Easy

📋 Given Parameters & Problem Setup

Phylum Chordata

Candidate Features Nerve cord type (A), Circulatory system (B), Pharyngeal gill slits (C), Heart position (D), Coelom type (E)

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The 30-Second Exam Hall Shortcut: ⚡ Chordata Fundamental Diagnostic Quartet

⏱️ Save ~25 seconds

Chordates have a DORSAL, HOLLOW, SINGLE nerve cord (ruling out A). Heart is VENTRAL (ruling out D). They are EUCOELOMATE (ruling out pseudocoelomate E). Closed circulation (B) and paired pharyngeal gill slits (C) are classic true chordate traits! Match Option (3) B and C only!

1 Statement A: Mid-dorsal, solid, double nerve cord -> False (Chordates have dorsal, HOLLOW, SINGLE nerve cord; solid double is non-chordate).

2 Statement B: Closed circulatory system -> True.

3 Statement C: Paired pharyngeal gill slits -> True.

4 Statement D: Dorsal heart -> False (Chordates have a VENTRAL heart; dorsal is non-chordate).

5 Statement E: Pseudocoelomate -> False (Chordates are coelomates; pseudocoelomates are Aschelminthes).

6 B and C only -> Select Option (3).

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Why You Can 100% Trust This Shortcut: Canonical NCERT Animal Kingdom comparison of chordates and non-chordates table.

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Fundamental Hallmarks of Phylum Chordata

Animals belonging to phylum Chordata are characterized by four defining morphological features present at some stage in their life history:

\text{Chordate Hallmarks} = \begin{cases} \mathbf{1.} & \text{Notochord} \\[2pt] \mathbf{2.} & \mathbf{\text{Dorsal, hollow, single nerve cord (}\neq\text{ solid, double)}} \\[2pt] \mathbf{3.} & \mathbf{\text{Paired pharyngeal gill slits (Statement C is TRUE)}} \\[2pt] \mathbf{4.} & \text{Post-anal tail} \end{cases}

Step 2

Contrast with Non-Chordate Anatomy

Comparing internal organ orientations against non-chordates:

\begin{aligned} \text{\textbf{Heart:}} & \quad \text{Chordates: } \mathbf{\text{Ventral}} \quad \longleftrightarrow \quad \text{Non-chordates: Dorsal} \\[3pt] \text{\textbf{Circulation:}} & \quad \text{Chordates: } \mathbf{\text{Closed system (Statement B is TRUE)}} \\[3pt] \text{\textbf{Coelom:}} & \quad \text{Chordates: } \mathbf{\text{True coelomates (Eucoelomate)}} \quad (\neq \text{Pseudocoelomate}) \end{aligned}

Step 3

Verbatim NCERT Table Reference

In Table 4.1 "Comparison of Chordates and Non-chordates", NCERT states: - "Central nervous system is dorsal, hollow and single." (Statement A is FALSE) - "Pharynx perforated by gill slits." (Statement C is TRUE) - "Heart is ventral." (Statement D is FALSE) - Chordates are true coelomates, while pseudocoelom is restricted to Aschelminthes (Statement E is FALSE).

⭐

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

✗ Incorrect

Verdict & Scientific Reason:

Contains false statements D (chordate heart is ventral) and E (chordates are eucoelomate).

⚠️

Student Fallacy (Why candidates pick this trap): Assuming heart is dorsal as in arthropods.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Contains false statements A (nerve cord is hollow, single) and D.

⚠️

Student Fallacy (Why candidates pick this trap): Conflating non-chordate ventral solid double nerve cord with chordates.

3 3

✓ 100% Correct

Verdict & Scientific Reason:

Statements B (closed circulation) and C (paired pharyngeal gill slits) are classic diagnostic chordate characters.

💡

Why this is airtight: None; textbook verbatim precision.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Includes false statements D and E.

⚠️

Student Fallacy (Why candidates pick this trap): Calling chordates pseudocoelomates.

⚠️

NTA Trap Alert: Chordate vs. Non-Chordate Anatomy Inversion Trap

NTA inverted two major features: nerve cord (hollow single made into solid double) and heart (ventral made into dorsal). Students who don't read with laser focus miss these classic reversals.

🛡️ How to avoid the -1 mark: Chordate CNS = Dorsal, Hollow, Single. Chordate Heart = Ventral. Coelom = True Coelom.

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Core NEET Syllabus Standard

NCERT Biology · Animal Kingdom Standard Benchmark

Core Scientific Principle Tested:

"Chordates possess closed circulatory systems and paired pharyngeal gill slits. Heart is ventral and nerve cord is dorsal, hollow and single."

Syllabus Focus: Phylum Chordata

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Zoology Question 194 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Chordata Fundamental Diagnostic Quartet

Step-by-Step Rigorous Workflow & Mathematical Proof

Fundamental Hallmarks of Phylum Chordata

Contrast with Non-Chordate Anatomy

Verbatim NCERT Table Reference

360° Option Elimination Engine Key Feature

NTA Trap Alert: Chordate vs. Non-Chordate Anatomy Inversion Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Animal Kingdom

Basis of Classification - Body Symmetry in Echinodermata

Class Reptilia - Locomotion and Heart Chamber Exceptions

Fundamental Diagnostic Characteristics of Phylum Chordata

Coelom Types and Mesodermal Linings (Pseudocoelomate)

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