Q.122 Botany ⭐ 360° Option Elimination Active

NEET 2023 Botany Question 122 Solution

Topic: Transport in Plants · Official NTA Booklet Code G5

Question

Given below are two statements: Statement I: The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height. Statement II: Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling. In the light of the above statements, choose the most appropriate answer from the options given below:

(1)Statement I is incorrect but Statement II is correct.
(2)Both Statement I and Statement II are correct.
(3)Both Statement I and Statement II are incorrect.
(4)Statement I is correct but Statement II is incorrect.

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Verified Against NTA Final Answer Key

Option (2) : Both Statement I and Statement II are correct.

📚 Transport in Plants Easy

📋 Given Parameters & Problem Setup

Statement I Forces generated by transpiration can lift xylem-sized column over 130 meters height.

Statement II Transpiration cools leaf surfaces sometimes 10 to 15 degrees by evaporative cooling.

⚡

The 30-Second Exam Hall Shortcut: ⚡ NCERT Transpiration Numbers: 130 meters & 10–15 °C

⏱️ Save ~20 seconds

Both statements are verbatim sentences from NCERT Transport in Plants! Transpiration pull can generate over 130 m lift and evaporative cooling reduces leaf temperatures by 10 to 15 °C. Both statements are correct!

1 Check Statement I: Transpiration pull can lift water column over 130 meters -> Verbatim NCERT, Correct.

2 Check Statement II: Evaporative cooling cools leaves 10 to 15 degrees Celsius -> Verbatim NCERT, Correct.

3 Both statements are factually true.

4 Match Option (2) Both Statement I and Statement II are correct.

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Plant Physiology water relations quantitative values.

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Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluation of Statement I (Transpiration Pull Magnitude)

The cohesion-tension-transpiration pull model explains the ascent of sap through tall trees. Transpiration generates negative suction pressures in xylem conduits up to $-2\text{ MPa}$ to $-3\text{ MPa}$ :

\text{Transpiration Suction Force} \implies \text{Lifts water column } > \mathbf{130\text{ metres high}}

Step 2

Evaluation of Statement II (Evaporative Cooling Effect)

Water has a high latent heat of vaporization ( $~2.44\text{ kJ/g}$ ). As water evaporates through open stomata into the atmosphere, it dissipates excess thermal energy from insolation:

\text{Evaporative Cooling} \implies \text{Cools leaf surfaces by } \mathbf{10\text{ to } 15^\circ\text{C}}

Step 3

Verbatim NCERT Confirmation

NCERT Transport in Plants states under "Transpiration and Photosynthesis - a Compromise": - "Measurements reveal that the forces generated by transpiration can create pressures sufficient to lift a xylem sized column of water over 130 metres high." - "It cools leaf surfaces, sometimes 10 to 15 degrees, by evaporative cooling." Both statements are fully correct.

⭐

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:

Statement I is factually correct: transpiration pull exceeds 130 meters.

⚠️

Student Fallacy (Why candidates pick this trap): Doubting that capillary/cohesion forces can achieve a 130-meter column lift.

2 2

✓ 100% Correct

Verdict & Scientific Reason:

Both statements are verbatim excerpts from NCERT Biology.

💡

Why this is airtight: None; exact textbook recall.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Both statements are true physiological facts.

⚠️

Student Fallacy (Why candidates pick this trap): Assuming physiological numerical values in NEET are intentionally fabricated.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Statement II is factually correct: cooling magnitude is 10 to 15 degrees Celsius.

⚠️

Student Fallacy (Why candidates pick this trap): Believing that 10 to 15 degrees cooling is physiologically too large.

⚠️

NTA Trap Alert: Numerical Skepticism Trap

Students frequently mistrust specific numerical data in statements (130 meters, 10 to 15 degrees), suspecting a deceptive modification.

🛡️ How to avoid the -1 mark: Memorize canonical NCERT constants: Transpiration pull = 130 meters; Leaf cooling = 10 to 15 °C.

📖

Core NEET Syllabus Standard

NCERT Biology · Transport in Plants Standard Benchmark

Core Scientific Principle Tested:

"Forces generated by transpiration can lift a xylem-sized column of water over 130 metres high, and evaporative cooling cools leaf surfaces 10 to 15 degrees."

Syllabus Focus: Transpiration - A Compromise

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2023 Botany Question 122 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ NCERT Transpiration Numbers: 130 meters & 10–15 °C

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluation of Statement I (Transpiration Pull Magnitude)

Evaluation of Statement II (Evaporative Cooling Effect)

Verbatim NCERT Confirmation

360° Option Elimination Engine Key Feature

NTA Trap Alert: Numerical Skepticism Trap

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Transport in Plants

Physical Properties of Water Driving Transpiration Pull & Guttation

Root Pressure and Guttation via Hydathodes

Active Transport Across Biological Membranes

Physical Properties of Water in Transpiration and Guttation

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