Model Answer

Rubber production in India is influenced by several key factors, including:

1. Climate and Geography: Rubber requires a tropical, humid climate with more than 200 cm of rainfall and temperatures above 25°C. India’s tropical climate, especially in regions like Kerala and Tamil Nadu, supports the growth of rubber trees.
2. Socio-economic Factors: The majority of rubber cultivation in India is carried out by smallholder farmers, accounting for about 91% of the cultivated area and 92% of the total production. These growers are mainly from resource-poor, rural, and tribal communities.
3. Soil Fertility: Rubber thrives in well-drained, loamy soil with no water stagnation, which is common in the undulating lands of rubber-growing regions.
4. Skilled Labour: India has a large labor force, both skilled and unskilled, involved in rubber cultivation and processing.
5. Government Support: The Indian government offers incentives through policies like the Rubber Act, 1947, and the National Rubber Policy of 2019, alongside subsidies and the role of the Rubber Board in supporting the industry.

Rubber Industry in India

India is the 6th largest producer of natural rubber globally, with key growing regions in Kerala, Tamil Nadu, and Karnataka. It is also the 2nd largest consumer of rubber worldwide, producing approximately 694,000 tonnes in 2017-18. However, the industry faces challenges such as declining productivity, rising labor costs, and conflicts with tire companies.

Model Answer

Air masses are large volumes of air that have a uniform temperature and moisture content, extending from the Earth’s surface to the lower stratosphere. They typically cover vast areas, sometimes thousands of kilometers, and can influence weather patterns over large regions. The characteristics of an air mass are determined by the temperature and humidity, which are shaped by the region where the air mass originates.

Types of Air Masses

1. Maritime Tropical (mT): Warm and humid, originating over tropical oceans.
2. Maritime Polar (mP): Cold and humid, forming over the oceans in polar latitudes.
3. Continental Polar (CP): Cold and dry, originating from land in the polar regions.
4. Tropical (CT): Hot and dry, originating over land in tropical regions.
5. Continental Arctic (CA): Extremely cold and dry, originating from the North Pole.
6. Continental Antarctic (CAA): Extremely cold and dry, originating from the South Pole.

Significance of Air Masses

Air masses influence local weather by carrying the temperature and moisture characteristics from their source regions to new areas. Fronts are formed when air masses meet, leading to significant changes in weather patterns. Air masses also modify their weather based on the surface they move over. For example, a continental polar air mass can pick up moisture from warmer waters.

Air masses contribute to precipitation, drought, and variations in weather. For instance, hot and dry air masses may lead to drought conditions, while moist air masses can cause rain and thunderstorms. Thus, air masses play a crucial role in determining the climate and weather of different regions.

Model Answer

Western disturbances are extra-tropical storms originating in the Mediterranean region, which bring sudden winter rains to the north-western parts of the Indian subcontinent. These disturbances travel from west to east, powered by the Westerlies—prevailing winds between 30° and 60° latitudes. The disturbance forms in low-pressure areas over the Mediterranean Sea and moves across Iran, Iraq, Afghanistan, and Pakistan, before picking up moisture from the Arabian Sea. This moisture contributes to precipitation, especially over the Western Himalayan Region, and further extends to Nepal, Bhutan, and Arunachal Pradesh.

Impact on Indian Weather

• Precipitation and Rainfall: Western disturbances contribute to about 5–10% of India’s total annual rainfall. During the winter months (November to March), they bring much-needed rain and snow to the north-western regions of India, which are otherwise dry.
• Snowfall: Between December and February, these disturbances are the primary source of snowfall in the Himalayas, replenishing regional snowpacks and aiding in the storage of water resources for later use.
• Monsoon Onset: Western disturbances also influence the seasonal dynamics of the Indian summer monsoon. By modulating the snowpack and albedo (reflectivity) of the Himalayas and Tibetan Plateau, they impact large-scale atmospheric circulation patterns that affect the onset of the monsoon.
• Regional Effects: The impact of western disturbances stretches up to regions like Patna, Bihar, where the resulting rain benefits rabi crops such as wheat, mustard, and barley.

Conclusion

Western disturbances are essential for India’s winter precipitation, sustaining water supplies, influencing regional crops, and contributing to snowpack formation in the Himalayas. Their role in the broader climate system, especially in light of global warming, underscores the need for careful monitoring to safeguard agricultural productivity.

Model Answer

Weathering

Weathering is the process through which rocks break down into smaller fragments due to mechanical disintegration and chemical decomposition. This process is driven by weather and climate elements and plays a crucial role in soil formation, landform creation, and the concentration of valuable ores like iron, copper, and manganese.

Types of Weathering Processes

Chemical Weathering

• Carbonation: Carbon dioxide reacts with water to form carbonic acid, which dissolves rocks like limestone (source: geology studies).
• Hydration: Minerals absorb water, expand, and eventually fracture the rock.
• Oxidation and Reduction: Iron-rich rocks oxidize in the presence of oxygen, and reduction occurs when oxygen is absent, typically below the water table.

Physical Weathering

• Unloading and Expansion: Removal of overlying rock leads to pressure release, causing rock layers to crack.
• Freeze-Thaw (Frost Wedging): Repeated freezing and thawing of water in cracks weaken rocks.
• Salt Weathering: Salts expand in heat, causing rock disintegration.

Biological Weathering

• Burrowing and Wedging: Animals like earthworms expose new rock surfaces to weathering.
• Plant Roots: Roots exert pressure that breaks apart rocks.

These processes often interact, with one type dominating based on local environmental conditions.

Model Answer

Key Challenges India Faces in Harnessing Its Energy Potential

India has significant renewable energy potential, particularly in solar power, due to its vast sunny and semi-arid regions. However, several challenges hinder the country’s ability to fully utilize this potential.

1. High Import Dependency: Over 80% of India’s solar photovoltaic modules are imported, primarily from China. Despite policies like Production Linked Incentives (PLIs) and Basic Customs Duty (BCD), local manufacturing has not sufficiently scaled up (Source: 2022 data).
2. Financing Issues: Maintaining subsidies and tax cuts for solar energy is challenging, especially with stressed finances of state governments and distribution companies (discoms). Achieving cost parity with conventional energy sources like thermal power is also a long-term goal.
3. Transmission & Distribution (T&D) Losses: T&D losses in India are around 40%, making solar energy generation less feasible due to inefficiencies in the grid system.
4. Land Acquisition: Acquiring large, open spaces for solar plants remains difficult, with delays and cost overruns in planned projects.

India’s renewable energy future depends on overcoming these obstacles through improved financing, policy reforms, and enhanced technological cooperation.