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GS Paper IUPSC Prelims 2017
Ecology & Ecosystems
Question No. 82Interactive Test Mode
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+2-0.66

Q82. Biological Oxygen Demand (BOD) is a standard criterion for:

Biological Oxygen Demand (BOD) is a standard criterion for:

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 2017 • Environment and Ecology

Correct Answer: Option (C) — Pollution assay in aquatic ecosystems

Concept & Option Breakdown

Standard Reference Verified

Biochemical Oxygen Demand (BOD) is the amount of dissolved oxygen required by aerobic microorganisms to biologically decompose organic matter present in a water sample over a standard time (e.g., 5 days at 20°C). It is a universally adopted parameter for assaying organic pollution in water bodies.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2017 (Q82)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Ecology & Ecosystems
Official Answer KeyOption (C) — (c) Pollution assay in aquatic ecosystems

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Frequently Asked Questions — UPSC Prelims 2017 Q82

What is the official answer for UPSC Prelims 2017 GS Paper I Question 82 (Environment and Ecology)?

The official UPSC answer key for this 2017 Environment and Ecology (Ecology & Ecosystems) question is Option (C): "(c) Pollution assay in aquatic ecosystems". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2017 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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