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Q.1
Based on: WBCS Prelims 2023
Which Indian state leads in rice production and consequently contributes the most to methane emissions from paddy fields?
A.Uttar Pradesh
B.Punjab
C.West Bengal
D.Andhra Pradesh
Explanation
Why Correct: West Bengal is India's largest rice-producing state, accounting for approximately 14-15% of national production. Its extensive paddy cultivation makes it the leading contributor to methane emissions from rice fields. Distractor Analysis: Uttar Pradesh is India's second-largest rice producer with significant cultivation in eastern districts. Punjab ranks third in rice production and has high productivity per hectare but lower total area than West Bengal. Andhra Pradesh is a major rice-growing state in southern India but produces less than West Bengal. Takeaway: The System of Rice Intensification (SRI) method reduces methane emissions by 22-64% through alternate wetting and drying techniques instead of continuous flooding.
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Q.2
Based on: WBCS Prelims 2020
Which greenhouse gas is primarily released from agricultural soil management and fertilizer use?
A.CO2
B.CH4
C.N2O
D.O3
Explanation
Why Correct: Nitrous oxide (N2O) mainly originates from agricultural soil management practices like fertilizer application and industrial processes. Distractor Analysis: Carbon dioxide (CO2) is the primary greenhouse gas from burning fossil fuels. Methane (CH4) primarily comes from agriculture, landfills, and natural gas leaks. Ozone (O3) forms in the lower atmosphere from photochemical reactions involving nitrogen oxides and volatile organic compounds. Takeaway: The Montreal Protocol (1987) addresses ozone-depleting substances, not greenhouse gases, which is a common confusion point with the Kyoto Protocol in exams.
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Q.3
Based on: WBCS Prelims 2001
Which of the following is specifically designed to combat wind erosion rather than water erosion?
A.Contour plowing
B.Terracing
C.Shelterbelts
D.Strip cropping
Explanation
Why Correct: Shelterbelts are rows of trees or shrubs planted perpendicular to prevailing winds to reduce wind speed and prevent soil erosion by wind. Distractor Analysis: Contour plowing is a water erosion control method that follows land contours to reduce runoff. Terracing creates level steps on slopes to control water erosion. Strip cropping alternates rows of crops to reduce water erosion. Takeaway: The Great Green Wall initiative in Africa and China's Three-North Shelter Forest Program are large-scale shelterbelt projects to combat desertification and wind erosion.
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Q.4
Based on: WBCS Prelims 2001
What is the primary long-term consequence of unchecked wind erosion in arid regions?
A.Formation of alluvial fans
B.Desertification
C.Accelerated chemical weathering
D.Increased soil fertility
Explanation
Why Correct: Desertification is the progressive degradation of land in arid and semi-arid areas, directly caused by persistent wind erosion removing fertile topsoil and reducing agricultural productivity. Distractor Analysis: Alluvial fans are depositional landforms created by water erosion in mountainous regions. Chemical weathering is dominated by moisture and temperature, not wind erosion. Soil fertility decreases when wind erosion removes nutrient-rich topsoil; it does not increase. Takeaway: The Great Green Wall initiative in Africa aims to combat desertification by planting a belt of trees across the Sahel region, similar to China's Three-North Shelter Forest Program.
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Q.5
Based on: WBCS Prelims 2001
Which of the following methods is specifically designed to control water erosion on sloping agricultural land?
A.Stubble mulching
B.Shelterbelts
C.Contour plowing
D.Sand dune stabilization
Explanation
Why Correct: Contour plowing involves plowing along the contour lines of a slope, creating ridges that slow water runoff and reduce soil erosion on sloping agricultural land. Distractor Analysis: Stubble mulching controls wind erosion by covering soil with crop residues. Shelterbelts are rows of trees planted to reduce wind speed, controlling wind erosion. Sand dune stabilization uses vegetation and windbreaks to prevent sand dune movement, a wind erosion control measure. Takeaway: Terracing is another effective method for water erosion control on steep slopes, where step-like structures are built to reduce runoff velocity.
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Q.6
Based on: WBCS Prelims 2001
In which Indian state is the Thar Desert located, where windbreaks are most extensively used to combat wind erosion?
A.Gujarat
B.Haryana
C.Rajasthan
D.Punjab
Explanation
Why Correct: Rajasthan hosts the Thar Desert, India's most wind-erosion-prone region, where shelterbelts and windbreaks are extensively deployed. Distractor Analysis: Gujarat includes the Rann of Kutch but not the Thar Desert core. Haryana has arid pockets but not the Thar. Punjab is agriculturally fertile and not a desert region. Takeaway: The Great Green Wall of Africa, a massive afforestation project, aims to combat desertification across the Sahel region, similar to China's Three-North Shelter Forest Program.
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Q.7
Based on: WBCS Prelims 2001
Shelterbelts for wind erosion control are planted in what direction relative to the prevailing wind?
A.Parallel to the wind direction
B.Perpendicular to the wind direction
C.At a 45-degree angle to the wind
D.In a circular pattern around fields
Explanation
Why Correct: Shelterbelts are rows of trees or shrubs planted perpendicular to the prevailing wind direction to maximize wind speed reduction and soil protection. Distractor Analysis: Planting parallel to the wind direction would channel wind rather than block it. A 45-degree angle provides partial but suboptimal reduction. Circular patterns are not standard for windbreak design. Takeaway: The Wind Erosion Equation (WEQ) developed by the USDA predicts soil loss based on factors like soil erodibility, climate, and shelterbelt effectiveness.
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