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GS Paper IUPSC Prelims 2011
Health & Medicine
Question No. 210Interactive Test Mode
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+2-0.66

Q210. When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because:

When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because:

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2011 • Science and Technology

Correct Answer: Option (B) — Roots are starved of energy

Concept & Option Breakdown

Standard Reference Verified

Complete circumferential removal of bark (girdling or ring barking) removes the outer phloem tissue located immediately beneath the bark. While interior xylem remains intact to transport water upwards, the downward transport of photosynthesized sugars/organic nutrients from leaves to the root system is completely severed. The root cells gradually starve of energy, die, and subsequently fail to absorb water and minerals, killing the entire tree.

Elimination Heuristic & Exam Approach

Xylem (water transport) is deep inside the wood; phloem (food/energy transport to roots) lies just under the bark.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2011 (Q210)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — Roots are starved of energy

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Frequently Asked Questions — UPSC Prelims 2011 Q210

What is the official answer for UPSC Prelims 2011 GS Paper I Question 210 (Science and Technology)?

The official UPSC answer key for this 2011 Science and Technology (Health & Medicine) question is Option (B): "Roots are starved of energy". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2011 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Xylem (water transport) is deep inside the wood; phloem (food/energy transport to roots) lies just under the bark.

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