Q.175 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 175 Solution

Topic: Neural Control and Coordination · Official NTA Booklet Code G5

Question

Match List I with List II with respect to human eye. List I: A. Fovea; B. Iris; C. Blind spot; D. Sclera. List II: I. Visible coloured portion of eye that regulates diameter of pupil; II. External layer of eye formed of dense connective tissue; III. Point of greatest visual acuity or resolution; IV. Point where optic nerve leaves the eyeball and photoreceptor cells are absent. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (2) : A-III, B-I, C-IV, D-II

📚 Neural Control and Coordination Easy

📋 Given Parameters & Problem Setup

Ocular Structures Fovea, Iris, Blind spot, Sclera

⚡

The 30-Second Exam Hall Shortcut: ⚡ Human Eye Diagnostic Matcher

⏱️ Save ~25 seconds

Match diagnostic definitions: Fovea = Greatest visual acuity / densely packed cones (III). Iris = Visible coloured portion regulating pupil (I). Blind spot = Optic nerve exit, no photoreceptors (IV). Sclera = External dense connective tissue coat (II)! Match Option (2)!

1 Fovea: Central pit of macula lutea with highest density of cones; point of greatest visual acuity -> A-III.

2 Iris: Visible coloured portion of eye controlling pupil diameter -> B-I.

3 Blind spot: Optic nerve exits, retinal vessels enter, rods and cones absent -> C-IV.

4 Sclera: External protective fibrous coat of dense connective tissue -> D-II.

5 Match combination: A-III, B-I, C-IV, D-II -> Option (2).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Neural Control and Coordination ocular anatomy profiles.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Anatomy and Optics of the Human Eye

Analyzing the structural layers and optical features of the eyeball:

\begin{aligned} \text{\textbf{A. Fovea:}} & \quad \text{Central pit of macula lutea; } \mathbf{\text{point of greatest visual acuity (resolution)}} \implies \mathbf{\text{III}} \\[4pt] \text{\textbf{B. Iris:}} & \quad \mathbf{\text{Visible coloured portion of eye that regulates diameter of pupil}} \implies \mathbf{\text{I}} \\[4pt] \text{\textbf{C. Blind spot:}} & \quad \mathbf{\text{Point where optic nerve leaves eyeball; photoreceptors absent}} \implies \mathbf{\text{IV}} \\[4pt] \text{\textbf{D. Sclera:}} & \quad \mathbf{\text{External layer of eye formed of dense connective tissue}} \implies \mathbf{\text{II}} \end{aligned}

Step 2

Verbatim NCERT References

NCERT states under Parts of an Eye: - "The external layer is composed of a dense connective tissue and is called the sclera." - "The iris is the visible coloured portion of the eye." - "Photoreceptor cells are not present in that region and hence it is called the blind spot." - "The fovea is a thinned-out portion of the retina where only the cones are densely packed. It is the point where the visual acuity (resolution) is the greatest."

Step 3

Option Elimination

Matching A-III immediately isolates Option (2) uniquely, confirming the answer within seconds.

⭐

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:

Mismatches Fovea with sclera description and Blind spot with visual acuity.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing fovea with the outer fibrous coat.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Exact 1-to-1 match with all four verbatim NCERT definitions of eye anatomy.

💡

Why this is airtight: None; textbook verbatim match.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Fovea with blind spot.

⚠️

Student Fallacy (Why candidates pick this trap): Inverting fovea and blind spot.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Fovea with iris.

⚠️

Student Fallacy (Why candidates pick this trap): Scrambling internal retinal spots with anterior uvea.

⚠️

NTA Trap Alert: Fovea vs. Macula Lutea vs. Blind Spot Trap

The blind spot has zero photoreceptors; Macula lutea is a yellowish pigment spot; Fovea centralis is the specific central pit inside the macula where ONLY cones are present with maximal resolution.

🛡️ How to avoid the -1 mark: Remember: Greatest visual acuity = Fovea. Zero photoreceptors = Blind spot.

📖

Core NEET Syllabus Standard

NCERT Biology · Neural Control and Coordination Standard Benchmark

Core Scientific Principle Tested:

"Fovea is point of greatest visual acuity; Iris is visible colored pupil regulator; Blind spot lacks photoreceptors where optic nerve exits; Sclera is dense connective tissue outer coat."

Syllabus Focus: Sense Organs (The Eye)

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Ready to attempt under real exam pressure?

Test your speed and accuracy in the authentic 200-minute timed NTA simulator.

Launch NEET 2023 CBT Test →

← Previous (Q.174) All Zoology Questions Grid Next (Q.176) →

Spotted a mistake in this solution? Report an error ([email protected])

⚖️ Legal & Fair Dealing Notice: Sourced from publicly released NEET 2023 question papers and NEET answer keys for private study, research, and non-commercial educational practice under Fair Dealing (Section 52(1)(a) of the Indian Copyright Act, 1957). Not affiliated with or endorsed by NTA or NMC.

NEET 2023 Zoology Question 175 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Human Eye Diagnostic Matcher

Step-by-Step Rigorous Workflow & Mathematical Proof

Anatomy and Optics of the Human Eye

Verbatim NCERT References

Option Elimination

360° Option Elimination Engine Key Feature

NTA Trap Alert: Fovea vs. Macula Lutea vs. Blind Spot Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Neural Control and Coordination

Cranial Meninges vs Pericardial Sac

Brain Regions: Functions of Pons, Hypothalamus, Medulla, and Cerebellum

Corpus Callosum Function and Anatomical Composition of the Brain Stem

Anatomy of the Human Ear: Organ of Corti, Cochlea, Eustachian Tube & Stapes

Solve 4 NEET Questions a Day — One per Subject