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GS Paper IUPSC Prelims 2022
Natural Resources
Question No. 45Interactive Test Mode
00:00
+2-0.66

Q45. Among the following crops, which one is the most important anthropogenic source of both methane and nitrous oxide?

Among the following crops, which one is the most important anthropogenic source of both methane and nitrous oxide?

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 2022 • Environment and Ecology

Correct Answer: Option (B) — Rice

Concept & Option Breakdown

Standard Reference Verified

Paddy (rice) fields are a major anthropogenic source of both methane (CH4) and nitrous oxide (N2O). Continuous flooding of rice paddies creates anaerobic soil conditions where methanogenic bacteria decompose organic matter and generate methane. Periodic draining, aeration, and heavy use of nitrogenous fertilizers drive nitrification and denitrification processes, releasing substantial amounts of nitrous oxide.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2022 (Q45)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Natural Resources
Official Answer KeyOption (B) — Rice

Related & Repeated Prelims PYQs (4)

Questions from other UPSC Prelims years testing the same or closely linked concept.

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2010 • Q24584% Match

Due to their extensive rice cultivation, some regions may be contributing to global warming. To what possible reason/ reasons is this attributable? 1. The anaer

Environment and Ecology • Natural ResourcesSolve
2010 • Q20684% Match

Due to their extensive rice cultivation, some regions may be contributing to global warming. To what possible reason/ reasons is this attributable? 1. The anaer

Geography • Indian GeographySolve
2008 • Q37982% Match

Consider the following: 1. Rice fields 2. Coal mining 3. Domestic animals 4. Wet lands Which of the above are sources of methane, a major greenhouse gas?

Science and Technology • Health & MedicineSolve
2009 • Q2281% Match

In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from

Science and Technology • Health & MedicineSolve

More PYQs from Environment and Ecology (Natural Resources)

Master the Environment and Ecology syllabus cluster by practicing these related previous year questions.

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“System of rice Intensification” of cultivation, in which alternate wetting and drying of rice fields is practised, results in: 1. Reduced seed requir

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Frequently Asked Questions — UPSC Prelims 2022 Q45

What is the official answer for UPSC Prelims 2022 GS Paper I Question 45 (Environment and Ecology)?

The official UPSC answer key for this 2022 Environment and Ecology (Natural Resources) question is Option (B): "Rice". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2022 question belong to?

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

To solve Natural Resources 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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Previous QuestionConsider the following freedom fighters: 1. Barindra Kumar Ghosh 2. Jogesh Chandra Chatterjee 3. Rash Behari Bose Who of the above was/were actively associated with the Ghadar Party?
Next Question“System of rice Intensification” of cultivation, in which alternate wetting and drying of rice fields is practised, results in: 1. Reduced seed requirement 2. Reduced methane production 3. Reduced electricity consumption Select the correct answer using the code given below