3 – Water Resources Questions & Answers

Content Structure

  • 1. NCERT Solutions
    • 1A. Multiple choice questions.
    • 1B. Match the Following
    • 1C. Answer the Following Questions in About 30 Words
    • 1D. Answer the Following Questions in About 120 Words
  • 2. Extra Questions and Answers
    • 2A. Multiple Choice Questions (MCQs)
    • 2B. Very Short Type Questions and Answers
    • 2C. Short Answer-type Questions
    • 2D. Case/Source-based Questions and Answers
    • 2E. Long Questions and Answers

1. NCERT Solutions

1. Multiple Choice Question (MCQ)

(ii) Which one of the following statements is not an argument in favour of multi-purpose river projects?
(a) Multi-purpose projects bring water to those areas which suffer from water scarcity.
(b) Multi-purpose projects by regulating water flow helps to control floods.
(c) Multi-purpose projects lead to large scale displacements and loss of livelihood.
(d) Multi-purpose projects generate electricity for our industries and our homes.

Ans: (c) Multi-purpose projects lead to large scale displacements and loss of livelihood.

2. Classify the Following

(i) Based on the information given below classify each of the situations as ‘suffering from water scarcity’ or ‘not suffering from water scarcity’.

(a) Region with high annual rainfall.
Ans: Not suffering from water scarcity.

(b) Region having high annual rainfall and large population.
Ans: Suffering from water scarcity.

(c) Region having high annual rainfall but water is highly polluted.
Ans: Suffering from water scarcity.

(d) Region having low rainfall and low population.
Ans: Suffering from water scarcity.

3. Identify the Mistakes and Rewrite the Statements Correctly

(iii) Here are some false statements. Identify the mistakes and rewrite them correctly.

(a) Multiplying urban centres with large and dense populations and urban lifestyles have helped in proper utilisation of water resources.
Ans: Multiplying urban centres with large and dense populations and urban lifestyles have led to over-exploitation and mismanagement of water resources.

(b) Regulating and damming of rivers does not affect the river’s natural flow and its sediment flow.
Ans: Regulating and damming of rivers affect the river’s natural flow and its sediment flow.

(c) Today in Rajasthan, the practice of rooftop rainwater harvesting has gained popularity despite high water availability due to the Indira Gandhi Canal.
Ans: Today in Rajasthan, the practice of rooftop rainwater harvesting has declined in many areas because of the availability of water through the Indira Gandhi Canal.

2. Answer the following questions in about 30 words.

(i) Explain how water becomes a renewable resource.
Answer: Water becomes a renewable resource because it is continuously recycled through the hydrological (water) cycle. Evaporation, condensation, and precipitation help replenish rivers, lakes, and groundwater naturally.

(ii) What is water scarcity and what are its main causes?
Answer: Water scarcity is the shortage of sufficient usable water to meet people’s needs. Its main causes are population growth, overuse of water, urbanisation, industrialisation, agriculture, unequal distribution of rainfall, and water pollution.

(iii) Compare the advantages and disadvantages of multi-purpose river projects.
Answer: Multi-purpose river projects provide irrigation, generate hydroelectric power, control floods, and supply water for industries and households. However, they displace people, damage forests and wildlife, disturb river ecosystems, and reduce the natural flow of sediments.

3. Answer the following questions in about 120 words.

(i) Discuss how rainwater harvesting in semi-arid regions of Rajasthan is carried out.
Answer: In the semi-arid regions of Rajasthan, people have practised rainwater harvesting for centuries to overcome water scarcity. Traditional methods include the construction of khadins, johads, and tankas. Khadins are embankments built across slopes to collect rainwater and increase soil moisture for farming. Johads are small earthen dams that store rainwater and help recharge groundwater. Tankas are underground tanks built near houses to collect rainwater from rooftops through pipes. The stored water is used for drinking and other household purposes during the dry season. These traditional systems help conserve water, improve groundwater levels, support agriculture, and ensure water availability in areas with very low rainfall.

(ii) Describe how modern adaptations of traditional rainwater harvesting methods are being carried out to conserve and store water.
Answer: Modern rainwater harvesting combines traditional knowledge with improved technology to conserve water. Rooftop rainwater harvesting systems collect rainwater through pipes and store it in tanks or recharge pits. In many buildings, schools, offices, and homes, the collected water is used for household needs or allowed to seep into the ground to recharge groundwater. Recharge wells, percolation pits, and check dams are also constructed to increase groundwater levels. In both rural and urban areas, these methods help reduce water scarcity, prevent flooding, improve groundwater availability, and ensure a reliable water supply. Modern rainwater harvesting is an effective and environmentally friendly way to conserve water for future generations.

2. Extra Questions and Answers

1A. Multiple choice questions.

1. Assertion (A): Even regions that receive adequate water may experience water scarcity.
Reason (R): In some areas, the available water is of poor quality and is not suitable for use.
a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c) Assertion is true, but Reason is false.
d) assertion is false, but Reason is true.

Ans: a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

2. Assertion (A): Multi-purpose river projects are built only to generate hydroelectric power.
Reason (R): Dams are also used for irrigation, water supply, flood control, recreation and fish breeding.

a) Both Assertion and Reason are true.
b) Assertion is true, but Reason is false.
c) Assertion is false, but Reason is true.
d) Both Assertion and Reason are false.

Ans: c

3. Assertion (A): Constructing large dams may affect the natural flow of rivers.
Reason (R): Fragmentation of rivers makes it difficult for aquatic fauna to migrate from one place to another.
a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c) Assertion is true, but Reason is false.
d) Assertion is false, but Reason is true.

Ans: a

4. Assertion (A): Rainwater harvesting is considered an effective method of water conservation.
Reason (R): Collected rainwater can be stored for future use or used to recharge groundwater.
a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c) Assertion is true, but Reason is false.
d) Assertion is false, but Reason is true.

Ans: a

5. Which of the following statements about dams are correct?

  1. Dams are built to store river water and rainwater for irrigation.
  2. Dams are used for generating electricity.
  3. Dams improve the migration of aquatic animals.
  4. Dams help in flood control.

a) 1 and 2 only
b) 2 and 3 only
c) 1, 2 and 4 only
d) 1, 2, 3 and 4

Ans: c

6. Study the following statements related to traditional rainwater harvesting systems.

  1. Guls and Kuls are diversion channels used in the Western Himalayas.
  2. Inundation channels were developed in the flood plains of Bengal.
  3. Tankas are underground storage structures mainly found in Rajasthan.
  4. Khadins are traditional water harvesting structures developed in Tamil Nadu.

a) 1, 2 and 3 only
b) 2, 3 and 4 only
c) 1 and 4 only
d) 1, 2, 3 and 4

Ans: a

Read the following passage carefully and answer Questions 16 to 20.

People in different parts of India have developed various methods of rainwater harvesting according to local conditions. In the Western Himalayas, diversion channels called Guls and Kuls are used for agriculture. Rooftop rainwater harvesting is commonly practised in Rajasthan. Khadins in Jaisalmer and Johads in other parts of Rajasthan store rainwater for agricultural use. Tankas are underground storage structures built inside houses or courtyards, mainly in Bikaner, Phalodi and Barmer. In the flood plains of Bengal, people developed inundation channels for irrigation. Tamil Nadu became the first state in India to make rooftop rainwater harvesting compulsory for all houses.

7. A farmer living in a hilly region diverts water through small channels from mountain streams to irrigate his fields. Which traditional rainwater harvesting system is he most likely using?
a) Johads
b) Guls and Kuls
c) Tankas
d) Khadins

Ans: b

8. A family in Rajasthan stores rainwater collected from the roof of their house in an underground storage structure built inside the courtyard. Which traditional system is being described?
a) Inundation Channel
b) Kul
c) Tanka
d) Johad

Ans: c

9. Which of the following pairs is correctly matched according to the passage?
a) Inundation Channels — Western Himalayas
b) Guls and Kuls — Flood Plains of Bengal
c) Khadins — Jaisalmer
d) Tankas — Tamil Nadu

Answer: c

10. Tamil Nadu is considered an important example in water conservation because it
a) built the largest number of dams in India.
b) made rooftop rainwater harvesting compulsory for all houses.
c) developed the Khadin system.
d) introduced inundation channels for irrigation.

Ans: b

11. Match List I with List II and choose the correct answer.

List IList II
A. Water Scarcity1. Prevents degradation of ecosystems
B. Water Conservation2. Poor quality of water
C. Multi-purpose River Projects3. Barrier across flowing water
D. Dam4. Irrigation, electricity and flood control

a) A–2, B–1, C–4, D–3
b) A–1, B–2, C–3, D–4
c) A–4, B–3, C–2, D–1
d) A–2, B–4, C–1, D–3

Ans: a

12. A village receives good rainfall every year, but the nearby river has become polluted due to human activities. As a result, the villagers do not have enough safe water for drinking and household use. Which statement best explains this situation?
a) Water scarcity occurs only in desert regions.
b) Water scarcity can arise because the available water is of poor quality.
c) Water scarcity is caused only by unequal rainfall.
d) Water scarcity exists only where there are no rivers.

Ans: b

13. A student is marking regions on an outline map of India to show traditional rainwater harvesting systems. Which of the following methods should be correctly matched with the Western Himalayas?
a) Johads
b) Guls and Kuls
c) Tankas
d) Inundation Channels

Ans: b

14. While preparing a project on traditional water conservation methods, a student identifies the region where Khadins are commonly practised. Which region should be marked on the map?
a) Flood Plains of Bengal
b) Jaisalmer
c) Bikaner
d) Western Himalayas

Ans: b

Very short type questions and answers

1. What is meant by water scarcity? 
Ans: Water scarcity is the shortage of water compared to its demand in a region. It is typically associated with areas experiencing low rainfall, drought-prone conditions, or severe over-exploitation of water resources.

2. What is ‘Palar Pani’? 
Ans: ‘Palar Pani’ is the local term used for rainwater in the arid and semi-arid regions of Rajasthan. It is widely considered the purest form of natural water and is traditionally stored in underground tankas.

3. Define ‘Guls’ or ‘Kuls’. 
Ans: ‘Guls’ or ‘Kuls’ are traditional diversion channels built by local communities in hilly and mountainous regions, such as the Western Himalayas. These channels are constructed primarily to route stream water for agricultural irrigation.

4. Why did Jawaharlal Nehru proclaim dams as the ‘temples of modern India’? 
Ans: Jawaharlal Nehru proclaimed dams as the ‘temples of modern India’ because these projects were expected to integrate agricultural and village economic development with rapid industrialisation and urban growth.

5. State the main objective of the Narmada Bachao Andolan. 
Ans: The Narmada Bachao Andolan is an NGO movement that initially focused on protecting the flora and fauna submerged by the Sardar Sarovar Dam. Its focus later shifted to securing proper rehabilitation for displaced poor people.

6. What are ‘Khadins’ and ‘Johads’? 
Ans: ‘Khadins’ and ‘Johads’ are traditional rainwater harvesting systems where agricultural fields are converted into rain-fed storage structures. These structures allow water to stand and moisten the soil, mostly found in Rajasthan.

7. What is a multipurpose river valley project? 
Ans: A multipurpose river valley project is a large dam built across a river to serve several objectives simultaneously, including irrigation, hydroelectricity generation, flood control, inland navigation, and fish breeding.

8. Mention two main causes of qualitative water scarcity. 
Ans: The qualitative degradation of water is primarily caused by the discharge of untreated domestic and industrial wastes, toxic chemicals, pesticides, and agricultural fertilizers into water bodies, making it hazardous for human use.

9. How is bamboo drip irrigation practiced? 
Ans: The bamboo drip irrigation system is a 200-year-old traditional practice in Meghalaya. It involves tapping stream and spring water using bamboo pipes to deliver water drop by drop directly to the plant roots.

10. Name any two states where roof top rainwater harvesting is commonly practiced. 
Ans: Roof top rainwater harvesting is traditionally and successfully practiced in the states of Rajasthan (especially in Bikaner, Phalodi, and Barmer) and Tamil Nadu, where it has been made legally compulsory for all houses.

11. What percentage of the earth’s total water volume exists as oceans? 
Ans: Oceans account for approximately 96.5 percent of the total volume of the world’s water, while only 2.5 percent exists globally as freshwate r.

12. Name the sophisticated water harvesting system built in ancient India during the first century B.C. 
Ans: Sringaverapura near Allahabad built a sophisticated water harvesting system that successfully channeled the flood water of the river Ganga into deep storage tanks.

13. Who constructed the tank in Hauz Khas, Delhi, and for what purpose? 
Ans: Sultan Iltutmish constructed the tank in Hauz Khas in the fourteenth century to supply water exclusively to the nearby Siri Fort area.

14. How did Chandragupta Maurya contribute to historical water resource management? 
Ans: Chandragupta Maurya built extensive dams, lakes, and complex irrigation systems across his empire to ensure stable water supplies for agriculture and public use.

15. How are dams classified based on the materials used for their construction? 
Ans: Dams are classified as timber dams, embankment dams, or masonry dams based on the specific structural materials used, with several distinct sub-types.

16. Mention the primary purpose of the Bhakra-Nangal project. 
Ans: The Bhakra-Nangal project built on the Satluj-Beas river basin is utilized jointly for hydel power production and agricultural irrigation across northern India.

Short-type questions and answers

1. Why is water considered a precious resource?
Ans: Water is a vital natural resource that supports all forms of life. It is essential for drinking, agriculture, industries, electricity generation, sanitation, and ecosystems. Although about three-fourths of the Earth is covered with water, only a small amount is available as freshwater for human use. Therefore, water must be used wisely and conserved.

2. What is water scarcity? Explain its major causes.
Ans: Water scarcity means the shortage of sufficient usable water to meet people’s needs. It is mainly caused by rapid population growth, urbanisation, industrialisation, intensive irrigation, over-exploitation of groundwater, unequal distribution of rainfall, and pollution of water sources. Poor management and excessive use of water have also increased water scarcity in many regions.

3. Why has water scarcity become a serious problem in India?
Ans: Water scarcity has become a serious problem because of increasing population, expanding cities, industrial development, intensive farming, and growing demand for water. Overuse of groundwater and pollution of rivers and lakes have reduced the availability of clean water. Uneven rainfall and climate variations have further worsened the situation in many parts of India.

4. Explain the need for water conservation.
Ans: Water conservation is necessary because freshwater resources are limited and demand is increasing rapidly. Conserving water ensures enough supply for agriculture, industries, households, and future generations. It also helps maintain ecological balance, recharge groundwater, reduce water scarcity, and protect rivers, lakes, and wetlands from depletion and pollution.

5. What are multi-purpose river projects?
Ans: Multi-purpose river projects are large projects that use river water for several purposes. They provide irrigation, generate hydroelectric power, control floods, supply drinking water, support industries, and promote navigation, fisheries, and recreation. These projects help in the planned and efficient use of available water resources.

6. State any four advantages of multi-purpose river projects.
Ans: Multi-purpose river projects provide irrigation to agricultural fields, generate hydroelectric power, control floods by regulating river flow, and supply water for domestic and industrial use. They also support inland navigation, fisheries, and recreation. These projects contribute to economic development and improve the utilisation of water resources.

7. Mention any four disadvantages of multi-purpose river projects.
Ans: Multi-purpose river projects displace large numbers of people and affect their livelihoods. They submerge forests and agricultural land, disturb aquatic ecosystems, reduce the natural flow of sediments, and impact biodiversity. They may also increase social conflicts over water sharing between different states and regions.

8. Why are dams referred to as the ‘temples of modern India’?
Ans: Dams were called the “temples of modern India” by Jawaharlal Nehru because they were expected to promote economic development. They provide irrigation, generate hydroelectric power, control floods, and supply water for industries and households. They were seen as symbols of national progress and self-reliance.

9. Why have many people opposed large dams in recent years?
Ans: Many people oppose large dams because they cause large-scale displacement of local communities, destroy forests and wildlife habitats, submerge fertile agricultural land, and disturb river ecosystems. They also reduce the natural flow of sediments and create conflicts over the distribution and use of water resources.

10. What is rainwater harvesting? Why is it important?
Ans: Rainwater harvesting is the process of collecting and storing rainwater for future use. It helps recharge groundwater, reduces water scarcity, prevents floods and soil erosion, and ensures water availability during dry seasons. It is an effective and environmentally friendly method of conserving water resources.

11. What are ‘khadins’ and ‘johads’?
Ans: Khadins and johads are traditional rainwater harvesting systems used in Rajasthan. Khadins are earthen embankments that collect runoff water for agriculture, while johads are small earthen check dams that store rainwater and recharge groundwater. These methods help conserve water in semi-arid regions.

12. What are tankas?
Ans: Tankas are underground tanks built mainly in Rajasthan to collect and store rainwater from rooftops and courtyards. The stored water is used for drinking and household purposes during dry periods. Tankas are an important traditional method of water conservation in desert regions.

13. Explain rooftop rainwater harvesting.
Ans: Rooftop rainwater harvesting is a method of collecting rainwater from rooftops through pipes and storing it in tanks or recharge pits. The stored water is used for domestic purposes or allowed to recharge groundwater. This method helps conserve water and reduces dependence on groundwater.

14. How does groundwater become depleted?
Ans: Groundwater becomes depleted due to excessive pumping for irrigation, industries, and domestic use. Rapid urbanisation, increasing population, and reduced recharge caused by concrete surfaces further lower groundwater levels. Poor rainfall and lack of water conservation also contribute to groundwater depletion.

15. How does industrialisation increase water scarcity?
Ans: Industries require large quantities of water for manufacturing and cooling processes. They often overuse groundwater and discharge untreated wastes into rivers and lakes, polluting freshwater sources. This reduces the availability of clean water and increases water scarcity in surrounding areas.

16. How does urbanisation affect water resources?
Ans: Urbanisation increases the demand for water due to growing populations and expanding cities. Concrete surfaces reduce groundwater recharge, while excessive extraction lowers groundwater levels. Domestic sewage and industrial waste also pollute water bodies, making clean water less available for human use.

17. Why is groundwater the most important source of freshwater in India?
Ans: Groundwater is the most important source of freshwater because it supplies water for irrigation, drinking, industries, and domestic purposes. It is easily available in many regions and supports agriculture throughout the year. However, excessive extraction has caused groundwater levels to decline in many areas.

18. How can every citizen help conserve water?
Ans: Every citizen can conserve water by avoiding wastage, repairing leaking taps, using water efficiently, practising rainwater harvesting, reusing water whenever possible, and protecting rivers and lakes from pollution. Public awareness and responsible use of water are essential for ensuring water security for future generations.

19. Why is there a need for integrated water resources management?
Ans: Integrated water resources management is needed to ensure the efficient, equitable, and sustainable use of water. It helps balance the needs of agriculture, industries, households, and ecosystems while preventing over-exploitation, pollution, and wastage. It also promotes the conservation of water resources for future generations.

20. How does agriculture contribute to water scarcity?
Ans: Agriculture is the largest consumer of water in India. Large quantities of water are used for irrigation, especially for water-intensive crops like rice and sugarcane. Excessive irrigation and over-extraction of groundwater reduce water availability and lead to water scarcity in many regions.

2D. Case/Source-based Questions and Answers

Read the passage carefully and answer the questions that follow:

In Meghalaya, a unique bamboo drip irrigation system has been used for over 200 years. Water from springs is carried through bamboo pipes to the fields. This method controls water flow and reduces wastage.

(a) Where is the bamboo drip irrigation system found?
Ans: The bamboo drip irrigation system is found in Meghalaya. It has been used by local communities for more than 200 years to irrigate agricultural fields.

(b) How does this system save water?
Ans: The bamboo pipes carry water slowly from springs to fields. This controls the flow of water, minimises wastage, and ensures efficient irrigation.

(c) Why is bamboo drip irrigation considered sustainable?
Ans: Bamboo drip irrigation uses locally available bamboo, reduces water wastage, and provides efficient irrigation. It is environment-friendly and supports sustainable use of water resources.

Read the passage carefully and answer the questions that follow:

Water is essential for agriculture, industries, households, and ecosystems. Sustainable development requires careful planning and efficient management of water resources. Integrated water resources management promotes conservation, equitable distribution, and efficient use of water.

(a) Why is integrated water resources management important?
Ans: Integrated water resources management ensures efficient use, conservation, and equitable distribution of water. It helps meet increasing water demand while protecting water resources for future generations.

(b) What is meant by sustainable use of water?
Ans: Sustainable use of water means using water wisely to meet present needs without reducing its availability for future generations. It promotes conservation and efficient management of water resources.

(c) Mention one measure to achieve sustainable water management.
Ans: Rainwater harvesting is an important measure for sustainable water management. It conserves rainwater, recharges groundwater, and reduces dependence on surface and underground water sources. These eight case-based sets cover the most frequently tested topics from the chapter: water scarcity, multipurpose river projects, dams, rainwater harvesting, traditional water conservation methods, bamboo drip irrigation, water conservation, and integrated water resources management.

Read the passage carefully and answer the questions that follow:

In the western parts of Rajasthan, where rainfall is very low and groundwater is often saline, people developed a traditional rainwater harvesting system called the tanka. A tanka is an underground tank used to collect rainwater from rooftops and store it for drinking purposes. Even today, many rural families depend on tankas during the dry season.

(a) Why are tankas important in Rajasthan?
Ans: Tankas are important because Rajasthan receives very little rainfall and groundwater is often saline. They collect and store rainwater for drinking and domestic use during the long dry season.

(b) How is water stored in a tanka?
Ans: Rainwater from rooftops or courtyards is collected through pipes and stored in an underground tank called a tanka. The stored water is mainly used for drinking purposes.

(c) What is one advantage of using tankas?
Ans: Tankas provide a reliable source of clean drinking water during dry periods. They conserve rainwater, reduce dependence on groundwater, and help people in water-scarce regions.

Read the passage carefully and answer the questions that follow:

Agriculture is the largest consumer of water in India. The Green Revolution increased food production but also increased the use of groundwater for irrigation. Water-intensive crops such as rice and sugarcane require large quantities of water. Continuous extraction of groundwater has lowered the water table in many parts of the country.

(a) Which sector uses the maximum amount of water in India?
Ans: Agriculture uses the maximum amount of water in India. Irrigation accounts for the largest share of water consumption because farming requires a regular supply of water for crop production.

(b) Why has groundwater use increased after the Green Revolution?
Ans: The Green Revolution encouraged intensive irrigation and the cultivation of water-intensive crops like rice and sugarcane. This increased the use of tube wells and groundwater for agriculture.

(c) What is one result of excessive groundwater extraction?
Ans: Excessive groundwater extraction lowers the water table. It reduces groundwater availability and creates water scarcity in many regions.

Read the passage carefully and answer the questions that follow:

Industries require large quantities of water for processing, cooling, and cleaning. Many industries discharge untreated wastes into rivers and lakes. This pollutes water sources and makes water unsafe for human use, agriculture, and aquatic life.

(a) Why do industries need water?
Ans: Industries need water for processing raw materials, cooling machines, cleaning equipment, and manufacturing products. Water is an essential resource for industrial production.

(b) How do industries pollute water?
Ans: Industries discharge untreated chemical wastes and effluents into rivers and lakes. These pollutants contaminate water and harm aquatic life and human health.

(c) Mention one way to reduce industrial water pollution.
Ans: Industrial wastes should be treated before being released into rivers and lakes. Proper treatment reduces pollution and helps protect water resources.

Read the passage carefully and answer the questions that follow:

The Narmada Bachao Andolan is a movement against large dams built across the Narmada River. The movement highlighted the problems of displacement, loss of forests, submergence of fertile land, and environmental damage. It demanded proper rehabilitation of the affected people.

(a) Why was the Narmada Bachao Andolan started?
Ans: The Narmada Bachao Andolan was started to oppose the displacement of people, submergence of forests and fertile land, and environmental damage caused by large dams on the Narmada River.

(b) What was one major demand of the movement?
Ans: The movement demanded proper rehabilitation and resettlement of people displaced by the construction of large dams.

(c) What issue did the movement highlight?
Ans: The movement highlighted the social and environmental costs of large dams, including displacement, loss of livelihoods, destruction of forests, and ecological imbalance.

Read the passage carefully and answer the questions that follow:

Freshwater is essential for life, but increasing population, urbanisation, and industrialisation have increased the demand for water. Sustainable development requires careful planning and conservation of water resources. Every individual should use water wisely and avoid wastage.

(a) Why has the demand for water increased?
Ans: The demand for water has increased due to rapid population growth, urbanisation, industrialisation, and expansion of agriculture. These activities require large quantities of water.

(b) Why is water conservation linked with sustainable development?
Ans: Water conservation ensures that water resources are used wisely and remain available for future generations. It supports sustainable development by reducing wastage and protecting the environment.

(c) State any two ways individuals can conserve water.
Ans: Individuals can conserve water by practising rainwater harvesting and avoiding unnecessary wastage of water. Efficient use of water helps protect this valuable resource for the future.

2E. Long Questions and Answers

1. Explain the need for water conservation and management in India.
Ans: Water is a renewable resource, but fresh water is limited and unevenly distributed. Rapid population growth, urbanisation, industrialisation, and intensive irrigation have increased the demand for water. Over-exploitation of groundwater has lowered the water table in many regions. Pollution from industries, domestic waste, and agriculture has reduced the quality of water. Climate change has also affected rainfall patterns. Therefore, water conservation and proper management are necessary to ensure sufficient water for agriculture, industries, households, and future generations. It also helps maintain ecological balance and supports sustainable development.

2. What is rainwater harvesting? Explain its importance.
Ans: Rainwater harvesting is the process of collecting and storing rainwater for future use instead of allowing it to run off. It helps recharge groundwater, raises the water table, and provides water during dry seasons. It reduces dependence on rivers and underground water. Rainwater harvesting also helps control floods and soil erosion. In both rural and urban areas, rooftop rainwater harvesting is an effective method of conserving water. This traditional practice has become important because of increasing water scarcity and the overuse of groundwater resources.

3. Describe the traditional methods of water harvesting practised in different parts of India.
Ans: India has a rich tradition of water harvesting. In Rajasthan, people built khadins, johads, and tankas to collect rainwater. In the Himalayan region, guls or kuls were used to divert water for irrigation. In the flood plains of Bengal, people developed inundation channels. In arid and semi-arid regions, tanks and ponds stored rainwater. In Tamil Nadu, every household was encouraged to have a rooftop rainwater harvesting structure. These traditional systems helped conserve water, recharge groundwater, and meet the needs of agriculture and daily life.

4. Why has multipurpose river valley project become the subject of criticism?
Ans: Multipurpose river valley projects have many benefits, but they have also been criticised. Large dams displace local people and submerge forests, agricultural land, and wildlife habitats. They disturb the natural flow of rivers and reduce the supply of sediments to flood plains and deltas. This affects soil fertility and aquatic life. Large reservoirs may also increase waterlogging and salinity in nearby areas. Many social movements have opposed large dams because of environmental damage and the problems faced by displaced people. Therefore, these projects need careful planning and proper rehabilitation measures.

5. Explain the advantages of multipurpose river valley projects.
Ans: Multipurpose river valley projects are called the “temples of modern India” because they serve many purposes. They provide irrigation to agriculture, generate hydroelectric power, control floods, and supply water for domestic and industrial use. They also help in inland navigation, fisheries, recreation, and soil conservation. These projects support agricultural and industrial development and improve the economy. They ensure better use of river water throughout the year. Thus, multipurpose projects play an important role in the development of the country.

6. Explain the causes of water scarcity in India.
Ans: Water scarcity in India is caused by both natural and human factors. Uneven distribution of rainfall and seasonal variations reduce the availability of water in many regions. Rapid population growth has increased the demand for water. Urbanisation, industrialisation, and expansion of irrigation have led to excessive use of water resources. Over-exploitation of groundwater has lowered the water table. Pollution from industries, agriculture, and domestic waste has reduced the quality of water. These factors together have created serious water scarcity in many parts of the country.

7. Explain how industrialisation and urbanisation have increased water scarcity.
Ans: Industries require large quantities of water for processing, cooling, and cleaning. They also discharge untreated waste into rivers and lakes, causing water pollution. Rapid urbanisation has increased the demand for drinking water, sanitation, and other domestic purposes. Growing cities often depend on groundwater, leading to its over-exploitation. Construction activities reduce the natural recharge of groundwater. As a result, both the quantity and quality of available water decline. Therefore, industrialisation and urbanisation have become major causes of water scarcity in India.

8. Explain the objectives and importance of the Narmada Bachao Andolan.
Ans: The Narmada Bachao Andolan is a movement against the construction of large dams on the Narmada River. It highlights the environmental issues and the problems of people displaced by such projects. The movement demands proper rehabilitation of affected families and protection of forests and wildlife. It also questions whether large dams are the best solution for water management. The movement has increased public awareness about sustainable development, environmental protection, and the need to balance development with the welfare of local communities.

9. Explain the role of community participation in water conservation.
Ans: Community participation plays an important role in water conservation. Local people understand their water needs and traditional methods of water management. Community efforts help maintain ponds, tanks, check dams, and rainwater harvesting structures. Public awareness encourages people to use water wisely and avoid wastage. Successful examples, such as the revival of johads in Rajasthan, show that people’s participation can improve groundwater levels and solve water problems. Active involvement of local communities ensures better management and sustainable use of water resources.

10. Why is integrated water resources management necessary?
Ans: Integrated water resources management means planning and managing water in a balanced and sustainable way. Water should be shared carefully among agriculture, industries, households, and the environment. Proper management helps reduce water wastage, improve irrigation efficiency, and protect water quality. Rainwater harvesting, groundwater recharge, pollution control, and public participation are important parts of this approach. Integrated management ensures that present needs are met without reducing the availability of water for future generations. It supports sustainable development and protects valuable water resources.

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