Q.189 Zoology ⭐ 360° Option Elimination Active

NEET 2023 Zoology Question 189 Solution

Topic: Organisms and Populations · Official NTA Booklet Code G5

Question

Match List I with List II. List I: A. Logistic growth; B. Exponential growth; C. Expanding age pyramid; D. Stable age pyramid. List II: I. Unlimited resource availability condition; II. Limited resource availability condition; III. The percent individuals of pre-reproductive age is largest followed by reproductive and post reproductive age groups; IV. The percent individuals of pre-reproductive and reproductive age group are same. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

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

📚 Organisms and Populations Easy

📋 Given Parameters & Problem Setup

List I (Growth / Pyramid Types) Logistic growth, Exponential growth, Expanding age pyramid, Stable age pyramid

List II (Conditions / Structures) Unlimited resources, Limited resources, Pre-reproductive largest, Pre-reproductive equals reproductive

⚡

The 30-Second Exam Hall Shortcut: ⚡ Population Growth & Pyramid Matcher

⏱️ Save ~25 seconds

Match standard ecological definitions: Logistic growth = Limited resources / carrying capacity (II). Exponential growth = Unlimited resources (I). Expanding pyramid = Pre-reproductive population largest (III). Stable pyramid = Pre-reproductive equals reproductive (IV)! Match Option (2)!

1 Logistic growth: Resources are limited, growth reaches carrying capacity K -> A-II.

2 Exponential growth: Unlimited resource availability condition (J-shaped curve) -> B-I.

3 Expanding age pyramid: Triangular, percent individuals of pre-reproductive age is largest -> C-III.

4 Stable age pyramid: Bell-shaped, pre-reproductive and reproductive percent are nearly equal -> D-IV.

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

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Organisms and Populations population dynamics and demography.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Population Growth Models and Resource Availability

Analyzing the population growth curves described in NCERT:

\begin{aligned} \text{\textbf{A. Logistic growth:}} & \quad \frac{dN}{dt} = rN\left(\frac{K-N}{K}\right) \implies \mathbf{\text{Limited resources (II)}} \\[4pt] \text{\textbf{B. Exponential growth:}} & \quad \frac{dN}{dt} = rN \implies \mathbf{\text{Unlimited resources (I)}} \end{aligned}

Step 2

Demographic Structure of Age Pyramids

Analyzing the age distribution profiles of human populations:

\begin{aligned} \text{\textbf{C. Expanding pyramid:}} & \quad \text{Triangular: Pre-reproductive } > \text{ Reproductive } > \text{ Post-reproductive} \implies \mathbf{\text{III}} \\[4pt] \text{\textbf{D. Stable pyramid:}} & \quad \text{Bell-shaped: Pre-reproductive } \approx \text{ Reproductive} \implies \mathbf{\text{IV}} \end{aligned}

Step 3

Option Verification

Matching A-II, B-I, C-III, D-IV perfectly corresponds to Option (2).

⭐

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 Exponential growth with stable pyramid description.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing growth curves with age structures.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Flawless 1-to-1 match with the canonical NCERT population growth and demography definitions.

💡

Why this is airtight: None; textbook verbatim match.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Exponential growth with expanding pyramid.

⚠️

Student Fallacy (Why candidates pick this trap): Swapping growth models and pyramid types.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Scrambles all associations.

⚠️

Student Fallacy (Why candidates pick this trap): Random guessing.

⚠️

NTA Trap Alert: Expanding vs. Declining Age Pyramid Trap

Expanding = Pre-reproductive is largest (broad base). Stable = Pre-reproductive and reproductive are equal. Declining = Pre-reproductive is smaller than reproductive (narrow base).

🛡️ How to avoid the -1 mark: Broad base (largest pre-reproductive) = Expanding. Equal base and middle = Stable.

📖

Core NEET Syllabus Standard

NCERT Biology · Organisms and Populations Standard Benchmark

Core Scientific Principle Tested:

"Logistic growth occurs with limited resources; Exponential growth occurs with unlimited resources; Expanding pyramid has largest pre-reproductive age; Stable pyramid has equal pre-reproductive and reproductive groups."

Syllabus Focus: Population Growth & Age Pyramids

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Zoology Question 189 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Population Growth & Pyramid Matcher

Step-by-Step Rigorous Workflow & Mathematical Proof

Population Growth Models and Resource Availability

Demographic Structure of Age Pyramids

Option Verification

360° Option Elimination Engine Key Feature

NTA Trap Alert: Expanding vs. Declining Age Pyramid Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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