CBSE Class 12 Geography NCERT Solutions: Water Resources
This section provides detailed NCERT Solutions for Class 12 Geography, Chapter 6: Water Resources. It covers the availability and spatial distribution of water resources in India, including surface water, groundwater, and lagoons/backwaters. The solutions also discuss the factors influencing water availability, such as precipitation, population growth, and industrial demands. Furthermore, it elaborates on the potential impacts of water scarcity, including social conflicts and disputes, and introduces the concept of watershed management and its role in sustainable development. These solutions are designed to help students understand the complexities of water resource management in India and prepare effectively for their examinations.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 12 |
| Subject | Geography |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | Chapter 6 |
Chapter summary
Chapter 6 of the Class 12 Geography textbook focuses on Water Resources in India. The NCERT Solutions provided here explain the total water availability, its uneven spatial distribution, and the primary sources like rivers, lakes, and groundwater. It also delves into the reasons for water depletion, the challenges of groundwater utilization in specific states, and the potential for social conflicts arising from water scarcity. The chapter concludes by introducing watershed management as a crucial strategy for sustainable development.
Learning outcomes
- Understand the concept of water as a resource and its classification.
- Analyze the spatial distribution of water resources in India.
- Identify the factors affecting water availability and its uneven distribution.
- Discuss the causes and consequences of water depletion.
- Explain the importance of groundwater utilization and its regional variations.
- Elaborate on the potential for social conflicts due to water scarcity.
- Define watershed management and its role in sustainable development.
Topics covered
Paper topics
- Water as a Resource
- Water Availability in India
- Surface Water Resources
- Groundwater Resources
- Lagoons and Backwaters
- Factors Determining Spatial Distribution
- Water Depletion
- Causes of Water Depletion
- Groundwater Utilization
- Water Scarcity and Social Conflicts
- Watershed Management
- Sustainable Development
Important topics
- Spatial Distribution of Water Resources
- Factors Affecting Water Availability
- Causes and Consequences of Water Depletion
- Groundwater Utilization in Key States
- Water Scarcity and Social Conflicts
- Watershed Management for Sustainability
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Questions and Solutions
Question 1
- Which one of the following types describes water as a resource?
- Abiotic resource (c) Non-renewable resource
- Biotic resource (d) Non-cyclic resource
- Which one of the following south Indian states has the highest groundwater utilization (in percent) of its total ground water potential?
- Tamil Nadu (c) Andhra Pradesh
- Karnataka (d) Kerala
- The highest proportion of the total water used in the country is in which one of the following sectors?
- Irrigation (c) Domestic use
- Industries (d) None of the above
- Water is best described as a Biotic resource because it is part of the living system and is continuously replenished through the water cycle. While it is abiotic in its chemical composition, its role in supporting life and its cyclical nature often lead to its classification in broader resource categories. Non-renewable resources are finite and deplete with use, which is not the case for water in the long term.
- Tamil Nadu has the highest groundwater utilization percentage among the South Indian states mentioned. This is largely due to intensive agricultural practices and the need to supplement surface water sources, especially in areas with high demand and limited rainfall.
- The Irrigation sector accounts for the highest proportion of total water used in India. Agriculture remains the largest consumer of water, essential for crop production across the country, although its share is projected to decrease with industrial and domestic demands rising.
Question 2
- It is said that the water resources in India have been depleting very fast. Discuss the factors responsible for depletion of water resources.
- What factors are responsible for the highest ground water development in the states of Punjab, Haryana and Tamil Nadu?
- Why the share of agriculture sector in total water used in the country is expected to decline?
- What can be possible impacts of consumption of contaminated/unclean water on the people?
- Water resources in India are depleting rapidly due to several factors. These include the immense pressure from a rapidly growing population, increasing demand from agriculture and industries, and contamination of available water sources. Climate change also contributes through increased evaporation due to higher temperatures.
- High groundwater development in Punjab, Haryana, and Tamil Nadu is driven by fertile lands supporting extensive agriculture, particularly after the Green Revolution. These states require significant water for irrigation to meet national food grain demands, supported by canal systems and groundwater extraction.
- The share of the agriculture sector in total water use is expected to decline because the economy is diversifying. As secondary (industrial) and tertiary (service) sectors grow, their demand for water increases, leading to a relative decrease in agriculture's share, even if absolute usage remains high.
- Consuming contaminated or unclean water can lead to severe health problems. These range from gastrointestinal illnesses and infections to long-term chronic diseases such as cancer, and effects on the nervous or reproductive systems, depending on the type and level of contamination.
Question 3
- Discus the availability of water resources in the country and factors that determine its spatial distribution?
- The depleting water resources may lead to social conflicts and disputes. Elaborate it with suitable examples?
- What is watershed management? Do you think it can play an important role in sustainable development?
- India possesses about 4 percent of the world's water resources, with an annual precipitation yielding around 4,000 cubic km. Surface water and replenishable groundwater contribute 1,869 cubic km, of which only 60% is usable, making the total utilizable resource approximately 1122 cubic km. The spatial distribution is uneven, influenced by:
- Surface Water: Primarily from over 10,360 rivers and their tributaries, along with lakes, ponds, and tanks.
- Groundwater: Total replenishable groundwater is about 432 cubic km. Utilization is high in north-western regions and parts of South India (Punjab, Haryana, Rajasthan, Tamil Nadu), moderate in states like Gujarat and Uttar Pradesh, and low in Chhattisgarh and Odisha.
- Lagoons and Backwaters: Found along India's indented coastlines (Kerala, Odisha, West Bengal), these brackish water bodies are used for fishing and cultivating specific crops like paddy and coconuts.
- Depleting water resources can significantly fuel social conflicts and disputes. The escalating demand for water from agriculture and industries, coupled with continuous population growth since the 1950s, has intensified water scarcity in many regions. This scarcity can exacerbate existing tensions and even trigger new conflicts over access to and control of water resources. For instance, prolonged droughts combined with poor water management and rapid population growth can lead to widespread thirst and hunger, creating social unrest as communities struggle to meet their basic daily water needs.
- Watershed management is the process of creating sustainable management strategies for a watershed, which is the area of land where all of the water that falls in it and drains off of it goes to a common outlet, such as a river, bay, or other body of water. It involves the conservation, development, and utilization of water, soil, and vegetation resources within a watershed. Yes, watershed management can play a crucial role in sustainable development. By ensuring the efficient use and conservation of water, it helps maintain ecological balance, prevents soil erosion, recharges groundwater, and supports agricultural productivity. This integrated approach contributes to the long-term well-being of both the environment and the communities dependent on its resources.
Common mistakes
- Confusing water as a biotic or non-renewable resource.
- Underestimating the impact of population growth on water depletion.
- Not recognizing the link between agricultural practices (like the Green Revolution) and high groundwater utilization.
- Failing to connect water scarcity with potential social conflicts and disputes.
- Overlooking the significance of watershed management for sustainable development.
Revision tips
- Focus on understanding the factors that cause uneven water distribution across India.
- Pay close attention to the states mentioned for high groundwater utilization and the reasons behind it.
- Review the causes of water depletion, including population growth and climate change.
- Understand the concept of watershed management and its importance for sustainable development.
- Practice explaining the link between water scarcity and social conflicts with examples.
Practice MCQs
Q1. Which of the following best describes water as a resource in the context of its renewability?
Explanation: Water is considered a cyclic resource because it is continuously replenished through the water cycle (evaporation, condensation, precipitation), making it renewable in nature, unlike non-renewable resources.
Q2. Which South Indian state is highlighted for having the highest groundwater utilization percentage?
Explanation: Tamil Nadu is identified as a state with very high groundwater utilization, alongside Punjab and Haryana, due to intensive agriculture and fertile land.
Q3. In India, which sector currently accounts for the highest proportion of total water usage?
Explanation: The agriculture sector, primarily for irrigation, consumes the largest share of water resources in India, although its share is expected to decline with the rise of industrial and tertiary sectors.
Q4. Rapid population growth contributes to water resource depletion primarily through:
Explanation: A growing population increases the demand for water for drinking, sanitation, and food production (agriculture), leading to greater pressure on available water resources.
Q5. The Green Revolution significantly impacted water resource development in which regions?
Explanation: The Green Revolution's success in Punjab and Haryana led to intensive agriculture, which in turn drove high groundwater development and canal system utilization in these states.
Frequently asked questions
What is the total water availability in India according to the NCERT solutions?
India has about 4,000 cubic km of water available from precipitation annually. The surface water and replenishable groundwater contribute 1,869 cubic km, with only 60% being usable, resulting in a total utilizable resource of 1122 cubic km.
Which factors influence the spatial distribution of water resources in India?
The spatial distribution is determined by factors like the presence of numerous rivers and tributaries (surface water), the replenishable groundwater potential in river basins, and the formation of lagoons and backwaters along the indented coastlines.
Why is groundwater utilization particularly high in states like Punjab, Haryana, and Tamil Nadu?
These states have highly fertile land, support intensive agriculture (especially after the Green Revolution), and often have extensive canal systems, leading to significant development and utilization of groundwater resources to meet agricultural demands.
How can depleting water resources lead to social conflicts?
As water becomes scarcer due to increased demand from agriculture, industries, and population growth, competition for this vital resource intensifies, potentially leading to disputes and conflicts between different users and regions.
What is watershed management and why is it important?
Watershed management involves the conservation, development, and utilization of water, soil, and vegetation resources within a drainage basin. It is crucial for sustainable development as it helps in managing water resources effectively, preventing soil erosion, and improving livelihoods.
What are the potential health impacts of consuming contaminated water?
Consuming contaminated water can lead to various health issues, including gastrointestinal illnesses, nervous system or reproductive problems, and chronic diseases like cancer. The severity depends on the contaminant, its concentration, and the duration of exposure.
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