Q.126 Botany ⭐ 360° Option Elimination Active

NEET 2023 Botany Question 126 Solution

Topic: Respiration in Plants · Official NTA Booklet Code G5

Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: ATP is used at two steps in glycolysis. Reason R: First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6- phosphate into fructose-1-6-diphosphate. In the light of the above statements, choose the correct answer from the options given below:

(1)A is false but R is true.
(2)Both A and R are true and R is the correct explanation of A.
(3)Both A and R are true but R is NOT the correct explanation of A.
(4)A is true but R is false.

✓

Verified Against NTA Final Answer Key

Option (2) : Both A and R are true and R is the correct explanation of A.

📚 Respiration in Plants Medium

📋 Given Parameters & Problem Setup

Assertion (A) ATP is used at two steps in glycolysis.

Reason (R) First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1,6-diphosphate.

⚡

The 30-Second Exam Hall Shortcut: ⚡ Glycolysis Energy Investment Steps: Hexokinase & PFK

⏱️ Save ~25 seconds

Glycolysis begins with an energy investment (preparatory) phase where exactly 2 ATP molecules are consumed: step 1 (Glucose -> G6P) and step 3 (F6P -> F-1,6-BP). Reason specifies these exact two steps, correctly explaining Assertion!

1 Assertion: 2 ATP molecules are utilized in glycolysis -> True (preparatory phase).

2 Reason: Step 1 (Hexokinase) consumes 1st ATP; Step 3 (Phosphofructokinase) consumes 2nd ATP -> True.

3 Reason provides the exact biochemical enumeration explaining why ATP is used at two steps.

4 Match Option (2) Both A and R are true and R is the correct explanation of A.

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Glycolysis biochemical preparatory phase stoichiometry.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

The Preparatory (Investment) Phase of Glycolysis

During the initial phase of the Embden-Meyerhof-Parnas (EMP) pathway, glucose is primed for cleavage via two irreversible kinase-catalyzed phosphorylation reactions:

\begin{aligned} \mathbf{\text{Step 1:}} & \quad \text{Glucose} + \mathbf{\text{ATP}} \xrightarrow{\text{Hexokinase}} \text{Glucose-6-phosphate} + \text{ADP} \\[4pt] \mathbf{\text{Step 3:}} & \quad \text{Fructose-6-phosphate} + \mathbf{\text{ATP}} \xrightarrow{\text{Phosphofructokinase}} \text{Fructose-1,6-bisphosphate} + \text{ADP} \end{aligned}

Step 2

Verbatim NCERT Reference

NCERT states verbatim: "ATP is utilised at two steps: first in the conversion of glucose into glucose 6-phosphate and second in the conversion of fructose 6-phosphate to fructose 1, 6-bisphosphate."

Step 3

Evaluation of Explanation Link

Assertion states that ATP is used at two steps. Reason identifies the exact two enzymatic reactions responsible for this consumption. Therefore, R is the direct and complete explanation of 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 1

✗ Incorrect

Verdict & Scientific Reason:

Assertion is factually true: exactly two steps in glycolysis consume ATP.

⚠️

Student Fallacy (Why candidates pick this trap): Thinking glycolysis only yields ATP without any investment phase.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Both statements are true and Reason provides the exact biochemical justification of Assertion.

💡

Why this is airtight: None; rigorous biochemical logic.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Reason explicitly details the two reactions cited in Assertion, constituting a direct causal explanation.

⚠️

Student Fallacy (Why candidates pick this trap): Misjudging the explanatory relationship between a general claim and its specific proof.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Reason is factually accurate and matches NCERT pathway steps verbatim.

⚠️

Student Fallacy (Why candidates pick this trap): Doubting whether fructose-6-phosphate conversion consumes ATP.

⚠️

NTA Trap Alert: Gross vs. Net ATP Yield Confusion

Glycolysis synthesizes 4 ATP molecules by substrate-level phosphorylation, but consumes 2 ATP in the preparatory phase, yielding a net of 2 ATP. Forgetting the 2 ATP investment leads to confusion.

🛡️ How to avoid the -1 mark: Remember: 2 ATP invested (steps 1 & 3) -> 4 ATP generated (steps 7 & 10) -> Net gain = 2 ATP.

📖

Core NEET Syllabus Standard

NCERT Biology · Respiration in Plants Standard Benchmark

Core Scientific Principle Tested:

"ATP is utilised at two steps: first in the conversion of glucose into glucose 6-phosphate and second in the conversion of fructose 6-phosphate to fructose 1, 6-bisphosphate."

Syllabus Focus: Glycolysis

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Botany Question 126 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Glycolysis Energy Investment Steps: Hexokinase & PFK

Step-by-Step Rigorous Workflow & Mathematical Proof

The Preparatory (Investment) Phase of Glycolysis

Verbatim NCERT Reference

Evaluation of Explanation Link

360° Option Elimination Engine Key Feature

NTA Trap Alert: Gross vs. Net ATP Yield Confusion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Respiration in Plants

Stoichiometry of Glycolysis (EMP Pathway)

Enzyme Complexes of the Mitochondrial Electron Transport Chain

Tricarboxylic Acid (TCA) Cycle: Substrate-Level Phosphorylation vs Oxidation

Cellular Compartments for Respiratory Processes

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