General Studies 2022 GS Paper I 15 marks 250 words Compulsory Explain

Q17

Troposphere is a very significant atmospheric layer that determines weather processes. How ? (Answer in 250 words) 15

हिंदी में प्रश्न पढ़ें

क्षोभमंडल वायुमंडल का एक महत्वपूर्ण परत है जो मौसम प्रक्रियाओं को निर्धारित करता है। कैसे ? (250 शब्दों में उत्तर दें)

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Directive word: Explain

This question asks you to explain. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'How?' requires explaining causal mechanisms and processes. Structure: brief introduction defining troposphere and its position; body paragraphs addressing temperature gradient, water vapor concentration, air pressure dynamics, and vertical/lateral air movements as drivers of weather; conclusion linking to climate change impacts or forecasting significance.

Key points expected

Temperature lapse rate (6.5°C/km) and its role in creating instability and convection currents
Concentration of water vapor (80-90% of atmospheric total) enabling cloud formation, precipitation, and latent heat transfer
Tropopause as boundary limiting vertical extent of weather phenomena
Pressure gradients and Coriolis force generating wind systems (planetary, regional, local)
Seasonal weather phenomena linked to tropospheric processes: monsoons, Western Disturbances, tropical cyclones
Human relevance: aviation turbulence, agricultural planning, disaster management

Evaluation rubric

Dimension	Weight	Max marks	Excellent	Average	Poor
Demand-directive understanding	20%	3	Precisely interprets 'How?' by establishing clear cause-effect linkages between tropospheric properties and specific weather outcomes; avoids mere description by showing process dynamics	Partially addresses causation but mixes description with explanation; some mechanistic links present but not consistently developed	Misreads directive as 'What is troposphere?' providing only definitional content without causal explanation of weather determination
Content depth & accuracy	20%	3	Accurately covers lapse rate, water vapor mechanics, pressure-wind relationships, and vertical mixing with correct scientific terminology; distinguishes weather vs. climate appropriately	Basic coverage of 2-3 mechanisms with minor factual errors or vague terminology; misses tropopause significance or convective dynamics	Significant scientific inaccuracies (e.g., confusing troposphere with stratosphere, incorrect lapse rate direction); superficial treatment of weather processes
Structure & flow	20%	3	Logical progression from physical properties → atmospheric dynamics → weather manifestations; smooth transitions between mechanisms; effective 250-word economy	Recognizable structure but uneven weighting or abrupt shifts; some repetition or digression into unrelated atmospheric layers	Disorganized or fragmented; no clear separation between properties and effects; severe imbalance (overlong introduction, truncated conclusion)
Examples / case-law / data	20%	3	Integrates specific Indian examples: monsoon trough oscillation, Western Disturbances in NW India, tropical cyclone formation in Bay of Bengal; or cites altitude-specific data (Mt. Everest conditions)	Generic weather examples without Indian specificity; or isolated mention of monsoon without mechanistic linkage to tropospheric properties	No concrete examples; or irrelevant examples from other atmospheric layers; purely theoretical treatment
Conclusion & analytical edge	20%	3	Forward-looking synthesis: climate change altering tropopause height, implications for extreme weather prediction, or tropospheric pollution-weather feedback; demonstrates interdisciplinary awareness	Summary restatement of main points without new insight; or brief mention of importance without analytical development	Absent or abrupt conclusion; or introduces entirely new unsubstantiated claims; purely descriptive closing

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