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GS Paper IUPSC Prelims 2020
Ecology & Ecosystems
Question No. 73Interactive Test Mode
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+2-0.66

Q73. Which of the following are the reasons/factors for exposure to benzene pollution? 1. Automobile exhaust 2. Tobacco smoke 3. Wood burning 4. Using varnished wooden furniture 5. Using products made of polyurethane Select the correct answer using the code given below:

Which of the following are the reasons/factors for exposure to benzene pollution?

  1. Automobile exhaust
  2. Tobacco smoke
  3. Wood burning
  4. Using varnished wooden furniture
  5. Using products made of polyurethane Select the correct answer using the code given below:
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 2020 • Environment and Ecology

Correct Answer: Option (A) — 1, 2 and 3 only

Concept & Option Breakdown

Standard Reference Verified

Major established sources of exposure to benzene (a volatile aromatic hydrocarbon) include automobile exhaust, cigarette/tobacco smoke, evaporation of gasoline, and incomplete combustion of wood and coal. While certain paints, varnishes, and polymers may emit trace volatile compounds, typical consumer varnished furniture and solid polyurethane products are not established primary exposure sources in standard atmospheric toxicology.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2020 (Q73)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Ecology & Ecosystems
Official Answer KeyOption (A) — (a) 1, 2 and 3 only

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Frequently Asked Questions — UPSC Prelims 2020 Q73

What is the official answer for UPSC Prelims 2020 GS Paper I Question 73 (Environment and Ecology)?

The official UPSC answer key for this 2020 Environment and Ecology (Ecology & Ecosystems) question is Option (A): "(a) 1, 2 and 3 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2020 question belong to?

This question belongs to GS Paper I under the subject "Environment and Ecology" and micro-topic "Ecology & Ecosystems". You can explore all repeated questions from Ecology & Ecosystems 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 Ecology & Ecosystems UPSC Prelims question using option elimination?

To solve Ecology & Ecosystems questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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