Q.163 Zoology ⭐ 360° Option Elimination Active

NEET 2026 Zoology Question 163 Solution

Topic: Organisms and Populations · Official NTA Booklet Code 50

Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The logistic growth model of populations is considered more realistic than the exponential growth model. Reason R: Resources are finite. In the light of the above statements, choose the most appropriate answer from the options given below:

(1)Both A and R are correct and R is the correct explanation of A
(2)Both A and R are correct but R is not the correct explanation of A
(3)A is correct but R is not correct
(4)A is not correct but R is correct

✓

Verified Against NTA Final Answer Key

Option (1) : Both (A) and (R) are true and (R) is the correct explanation of (A)

📚 Organisms and Populations Medium

📋 Given Parameters & Problem Setup

Assertion (A) Logistic growth model is considered more realistic than exponential growth model.

Reason (R) In nature, resources are finite and become limiting, leading to competition among individuals.

⚡

The 30-Second Exam Hall Shortcut: ⚡ "Because" Bridge Test

⏱️ Save ~40 seconds

Logistic is realistic BECAUSE natural resources are finite and limiting!

1 Read Assertion (A): Logistic growth is considered more realistic than exponential growth -> TRUE (NCERT verbatim).

2 Read Reason (R): Resources are finite and become limiting, leading to competition -> TRUE (NCERT verbatim).

3 Connect with "BECAUSE": Logistic growth is more realistic BECAUSE no population in nature has unlimited resources; resources are finite and limiting, leading to competition for carrying capacity (K).

4 Reason (R) gives the exact biological cause for Assertion (A).

5 Pick Option (1) with absolute certainty.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Organisms and Populations (Age Pyramids: Expanding triangular pyramid with large pre-reproductive base).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluate Assertion (A)

Resource availability is obviously essential for the unimpeded growth of a population. In nature, a given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible (carrying capacity K). Thus, the logistic model is considered more realistic than exponential growth.

\frac{dN}{dt} = rN \left(\frac{K - N}{K}\right) \quad (\text{Verhulst-Pearl Logistic Growth})

• Assertion (A) is completely true.

Step 2

Evaluate Reason (R) and Explanatory Link

In the real world, food and space are never unlimited. Competition for these limited resources inevitably occurs among individuals, eventually resulting in the survival and reproduction of the fittest, establishing an upper asymptote at carrying capacity K. Thus, Reason (R) is true and is the precise scientific rationale for (A).

\text{Finite Resources} \rightarrow \text{Intraspecific Competition} \rightarrow \text{Growth Decelerates to } K \implies (R) \text{ explains } (A)

• Both are true, and (R) correctly explains (A).

⭐

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

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Logistic growth is realistic precisely because resources in the real world are finite and limiting.

💡

Why this is airtight: None; classic textbook assertion-reason relationship.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. (R) directly explains why logistic growth represents reality over idealized exponential growth.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to see that finite resources are the foundational basis of logistic growth.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Reason (R) is a universally accepted biological fact.

⚠️

Student Fallacy (Why candidates pick this trap): Assuming natural resources are unlimited.

4 D

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Assertion (A) is a canonical statement in NCERT.

⚠️

Student Fallacy (Why candidates pick this trap): Believing exponential growth is realistic.

⚠️

NTA Trap Alert: Disconnecting Carrying Capacity from Finite Resources

Students sometimes think carrying capacity is an arbitrary mathematical construct rather than a direct consequence of finite food, water, and shelter.

🛡️ How to avoid the -1 mark: Remember: Real world = Limited resources = S-shaped Logistic curve = Realistic.

📖

Core NEET Syllabus Standard

NEET Biology Core Syllabus · Organisms and Populations Standard Benchmark

Core Scientific Principle Tested:

"Logistic growth model is considered more realistic since resources in nature are finite and limiting."

Syllabus Focus: Logistic Growth & Carrying Capacity

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Limited resources Limit growth = Logistic is Logical!

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NEET 2026 Zoology Question 163 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Because" Bridge Test

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluate Assertion (A)

Evaluate Reason (R) and Explanatory Link

360° Option Elimination Engine Key Feature

NTA Trap Alert: Disconnecting Carrying Capacity from Finite Resources

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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