Q.132 Botany ⭐ 360° Option Elimination Active

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NEET 2026 Botany Question 132 Solution

Topic: Animal Kingdom · Official NTA Booklet Code 50

Question

Which of the following is not a characteristic of chordates?

(1)Presence of notochord
(2)Central nervous system is dorsal
(3)Absence of gills
(4)Presence of post anal part (tail)

✓

Verified Against NTA Final Answer Key

Option (3) : Absence of gills

📚 Animal Kingdom Easy

📋 Given Parameters & Problem Setup

Phylum Chordata

Evaluation Goal Identify which feature is NOT a characteristic of chordates

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The 30-Second Exam Hall Shortcut: ⚡ 4 Chordate Hallmarks Rule

⏱️ Save ~40 seconds

Chordates MUST have Pharyngeal Gill Slits! "Absence of gills" is NOT a chordate trait!

1 Recall the four fundamental hallmarks of Phylum Chordata:

2 Presence of Notochord (Option 1 is a true hallmark).

3 Central nervous system is dorsal, hollow, and single (Option 2 is a true hallmark).

4 Paired pharyngeal gill slits present at some developmental stage.

5 Presence of post-anal tail (Option 4 is a true hallmark).

6 Option (3) claims "Absence of gills" -> Chordates are characterized by the PRESENCE of pharyngeal gill slits, not their absence!

7 Therefore, Option (3) is NOT a characteristic of chordates.

8 Select Option (3) in under 5 seconds!

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Animal Kingdom (Diagnostic Chordate Characters: Notochord, dorsal hollow nerve cord, and pharyngeal gill slits).

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Fundamental Hallmarks of Phylum Chordata

Animals belonging to phylum Chordata are fundamentally characterized by four structural features present at some stage during their ontogeny (embryonic or adult life): (1) A solid, unsegmented dorsal notochord, (2) A dorsal hollow nerve cord, (3) Paired pharyngeal gill slits, and (4) A post-anal tail.

\text{Chordate Hallmarks} = \left\{ \begin{array}{l} 1. \; \text{Notochord} \\ 2. \; \text{Dorsal hollow CNS} \\ 3. \; \mathbf{Paired\text{ pharyngeal gill slits (PRESENCE)}} \\ 4. \; \text{Post-anal tail} \end{array} \right\}

• In terrestrial amniotes, pharyngeal pouches form in embryos and give rise to structures like Eustachian tubes.

Step 2

Contrast with Non-chordates (Table 4.1)

Table 4.1 in NCERT directly compares chordates and non-chordates: In chordates, "Pharyngeal gill slits are present", whereas in non-chordates, "Gill slits are absent".

\text{Pharyngeal gill slits}: \begin{cases} \text{Chordates} &: \mathbf{Present} \\ \text{Non-chordates} &: \text{Absent} \end{cases}

• Stating "Absence of gills" contradicts chordate taxonomy.

Step 3

Evaluate Options

Option (1) Presence of notochord (True chordate trait). Option (2) Central nervous system is dorsal (True chordate trait). Option (3) Absence of gills (NOT a chordate trait; chordates have pharyngeal gill slits). Option (4) Presence of post-anal tail (True chordate trait).

\text{Not a characteristic} = \mathbf{Absence\text{ of gills}} \implies \text{Option (3)}

• Matches official NTA final answer key Option C / (3).

⭐

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 A

✗ Incorrect

Verdict & Scientific Reason:

This is the primary diagnostic feature from which Chordata derives its name; hence not the answer to this negative question.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to notice the negative query "not a characteristic".

2 B

✗ Incorrect

Verdict & Scientific Reason:

True chordate characteristic (dorsal, hollow, single CNS).

⚠️

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

3 C

✓ 100% Correct

Verdict & Scientific Reason:

100% accurate answer. Chordates are defined by the presence of paired pharyngeal gill slits, making "absence of gills" incorrect for chordates.

💡

Why this is airtight: None; sharp analytical reading of chordate anatomy.

4 D

✗ Incorrect

Verdict & Scientific Reason:

True chordate hallmark (post-anal tail provides propulsion in aquatic forms).

⚠️

Student Fallacy (Why candidates pick this trap): Overlooking that human coccyx is an embryonic post-anal tail remnant.

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NTA Trap Alert: Dorsal vs Ventral Nerve Cord

NEET examiners love testing: Chordates = Dorsal, hollow, single CNS. Non-chordates = Ventral, solid, double CNS. Always keep this contrast sharp.

🛡️ How to avoid the -1 mark: Chordates have the spinal cord running down the BACK (Dorsal)!

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Core NEET Syllabus Standard

NEET Biology Core Syllabus · Animal Kingdom Standard Benchmark

Core Scientific Principle Tested:

"Chordates are characterized by a notochord, dorsal hollow nerve cord, paired pharyngeal gill slits, and a post-anal tail."

Syllabus Focus: Phylum Chordata - General Characters

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Chordates boast the big four: Notochord, Dorsal cord, Tail behind the door, and Gill slits on the floor!

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NEET 2026 Botany Question 132 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ 4 Chordate Hallmarks Rule

Step-by-Step Rigorous Workflow & Mathematical Proof

Fundamental Hallmarks of Phylum Chordata

Contrast with Non-chordates (Table 4.1)

Evaluate Options

360° Option Elimination Engine Key Feature

NTA Trap Alert: Dorsal vs Ventral Nerve Cord

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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