Question:
Under Indian conditions, ____aspects are exposed to greater amount of insolation.
Under Indian conditions, ____aspects are exposed to greater amount of insolation.
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Hottest Aspect = South-West (Evening sun + hot air).
Coolest Aspect = North-East (Morning sun only + shaded for most of the day). This heavily influences where you plant specific species in hilly terrain.
Coolest Aspect = North-East (Morning sun only + shaded for most of the day). This heavily influences where you plant specific species in hilly terrain.
Updated On: Aug 7, 2026
- South Western
- North Eastern
- Southern
- Northern
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
"Aspect" refers to the compass direction that a slope faces. "Insolation" refers to incoming solar radiation. The question asks which direction in India receives the maximum heat and light from the sun.
Step 2: Detailed Explanation:
• Solar Geometry: India is in the Northern Hemisphere. The sun remains to the south of the zenith for most of the year. Therefore, Southern aspects are generally warmer than Northern aspects.
• Why South-Western? While the Southern aspect receives the most midday sun, the South-Western aspect receives intense sunlight during the afternoon.
• Cumulative Effect: During the afternoon, the ambient air temperature is already high. The addition of direct solar radiation makes the South-Western slopes the hottest and driest. These are known as "hot" aspects.
• Silvicultural Impact: On South-Western aspects, evaporation and transpiration rates are extreme. Soil moisture is often low, making it difficult to establish sensitive tree species. Hardier, drought-resistant species are usually found here. In contrast, Northern and North-Eastern aspects are "cool" and moist, supporting more lush vegetation.
Step 3: Final Answer:
In India, the South Western aspects are exposed to the highest amount of insolation and heat.
"Aspect" refers to the compass direction that a slope faces. "Insolation" refers to incoming solar radiation. The question asks which direction in India receives the maximum heat and light from the sun.
Step 2: Detailed Explanation:
• Solar Geometry: India is in the Northern Hemisphere. The sun remains to the south of the zenith for most of the year. Therefore, Southern aspects are generally warmer than Northern aspects.
• Why South-Western? While the Southern aspect receives the most midday sun, the South-Western aspect receives intense sunlight during the afternoon.
• Cumulative Effect: During the afternoon, the ambient air temperature is already high. The addition of direct solar radiation makes the South-Western slopes the hottest and driest. These are known as "hot" aspects.
• Silvicultural Impact: On South-Western aspects, evaporation and transpiration rates are extreme. Soil moisture is often low, making it difficult to establish sensitive tree species. Hardier, drought-resistant species are usually found here. In contrast, Northern and North-Eastern aspects are "cool" and moist, supporting more lush vegetation.
Step 3: Final Answer:
In India, the South Western aspects are exposed to the highest amount of insolation and heat.
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