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Water A Precious Resource

Water: A Precious Resource - Class 7 Science Worksheets with Answers (2025-26)

Prepare for exams with Class 7 Science Water: A Precious Resource worksheets and stepwise answers

CBSE Class 7 Science Water: A Precious Resource Worksheets with Answers for Chapter 16 in PDF format to download prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Register Online for NCERT Solutions Class 7 Science tuition on Vedantu to score more marks in CBSE board examination. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions ,can download Class 7 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.

Topics in CBSE Class 7 Science Chapter -16 Water: A Precious Resource:

The production, nature, and various phenomena of light are discussed in this chapter. This chapter is made enjoyable to study and understand using real-life examples, visuals, and activities. All topics in CBSE Class 7 Science are covered in depth to ensure that students have a thorough understanding of the subject. Concise and easy-to-understand explanations of topics and principles are provided. This answer summarises the CBSE Class 7 Science knowledge and skills as outlined in the most recent syllabus. Exercises have been properly rated to assist pupils in moving up and down each level.

S.No	Topic Name
1	How much water is available
2	Forms of water
3	Groundwater as an important source of water
4	Depletion of water table
5	Distribution of water
6	Water management
7	What role you an play
8	Effect of water scarcity on plants

Importance of CBSE Class 7 Chapter - 16 :

Water: A Precious Resource, Chapter 16 of Class 7 Science, covers everything about water. It informs students about the various types of water that exist on the planet. The abundance of water on our planet Earth is also discussed in the Water Class 7 notes. Students will learn about groundwater as well. It is, without a doubt, a vital supply of water. In the same way, students will be made aware of the underground water table's depletion. It focuses on the environmental distribution, with a particular focus on our country. It raises student awareness of their role in water conservation. Furthermore, the impact of water scarcity on plants is briefly explored in the water class 7 revision notes available on vedantu website.

How Much Water is There on the Planet?

Water covers 71% of the Earth's surface. However, living organisms are unable to consume all of this. Saline water makes up 97 percent of the earth's water, which is found in the oceans, while freshwater makes up 3% of the earth's water, which is found in ice caps, glaciers, and underground. Fresh water can be found underground, in rivers, and in lakes. Even then, only 1% of our freshwater is readily available, with the majority of it trapped in glaciers and snowfields.

Water in Its Various Forms:

Solid state - On the surface of the world, water occurs in the solid state as ice and snow.
Liquid state - Water can be found in a liquid condition in rivers, lakes, oceans, and underground.
Water vapour exists in the atmosphere in a gaseous state.

Water Cycle in Environment:

The Water Cycle explains how water moves through the system. The water cycle is a natural occurrence that occurs on a constant basis on our planet. The water cycle keeps the amount of water on the planet constant. Evaporation, condensation, precipitation, and water collecting are the four steps of the process.

What is the Definition of Groundwater?

Groundwater is the water that is present underneath a location's water table. This water collects inside the soil due to a variety of factors:

Rainwater that pours on the land penetrates into the earth.
Water from rivers, lakes, and ponds frequently seeps into the ground, accumulating as groundwater.

Infiltration is the process through which water collects in the ground by travelling through the pores of the soil. Aquifer - An aquifer is an underground layer of rocks that contains water between fissures and empty places.

Groundwater Level Depletion:

If humans continue to take out more water than is replaced by rainfall, the water table of a location may be depleted. Water table depletion can be caused by a number of factors, including:

Increased Population - As the population of a region grows, so does the need for freshwater. This necessitates the use of additional water. In addition, a growing population necessitates the development of new dwellings, businesses, factories, buildings, and roadways.
Many other factors contribute to water table depletion, including increased industries, agricultural activities, deforestation, and low rainfall.

Water Distribution:

Different elements such as rainfall and climatic conditions have little effect on the distribution of water across the globe. Some areas have a lot of water, while others have a lot of water scarcity.

Water Management:

Rainwater is normally allowed to flow away when it falls on the earth. It can, however, be conserved and utilised to restore the Earth's groundwater levels. Rainfall harvesting is the technique of keeping rainwater from flowing away and storing it for various uses such as refilling groundwater levels, home tasks, or industrial applications.

FAQs on Water: A Precious Resource - Class 7 Science Worksheets with Answers (2025-26)

1. What are some key measures for water conservation that could be asked as a 5-mark important question for the Class 7 Science exam?

For a 5-mark question on water conservation, students should focus on explaining multiple effective methods. Important measures include:

Rainwater Harvesting: Collecting and storing rainwater in tanks or allowing it to seep into the ground to recharge the water table.
Drip Irrigation: A highly efficient method in agriculture where water is supplied directly to the base of the plants, minimising evaporation.
Repairing Leaks: Immediately fixing leaking taps and pipes at home and in public places to prevent significant water wastage over time.
Practising Water-Wise Habits: Turning off taps while brushing teeth, using a bucket instead of a shower for bathing, and reusing water from washing clothes for mopping floors.
Preventing Deforestation: Planting more trees, as forests slow down the run-off of rainwater and help it percolate into the soil, thus maintaining the groundwater level.

2. Explain the main factors that are responsible for the depletion of the water table. This is a frequently asked question.

The depletion of the water table is a critical issue and a frequently asked topic in exams. The primary factors responsible are:

Increasing Population: A growing population increases the demand for water for drinking, cooking, and sanitation, leading to excessive withdrawal of groundwater.
Industrialisation: Industries require vast amounts of water for their processes. As more industries are set up, the withdrawal of groundwater increases significantly.
Agricultural Activities: Most farmers rely on groundwater for irrigating their crops. The increasing demand for food has led to more intensive farming and higher water consumption, depleting aquifers.
Deforestation: Trees play a vital role in the water cycle by helping rainwater seep into the ground. Cutting down forests reduces groundwater recharge and allows water to run off the surface.

3. How does water scarcity affect plant life and the ecosystem? What are the expected consequences?

Water scarcity has severe consequences for plants, which can be a key point in a 3-mark question. The main effects are:

Inability to Perform Photosynthesis: Plants need water to make food. Without sufficient water, photosynthesis stops, and the plant cannot produce energy.
Lack of Nutrient Absorption: Water is the medium through which plants absorb essential nutrients from the soil. A lack of water means plants cannot get the nutrients needed for growth.
Wilting and Death: Due to water loss through transpiration and lack of intake, plants lose their turgidity, wilt, and eventually die.
Ecosystem Disruption: The death of plants leads to a lack of food and oxygen for other living organisms, potentially causing a collapse of the local ecosystem.

4. What is the water cycle? What types of questions can be expected from this topic for the CBSE Class 7 exam (2025-26)?

The water cycle describes the continuous movement of water on, above, and below the surface of the Earth. For the 2025-26 exams, students can expect:

Very Short Answer (VSA) Questions: Defining key terms like evaporation, condensation, transpiration, and precipitation.
Short Answer Questions: Explaining one or two processes of the water cycle in detail.
Diagram-Based Questions: A 3 or 5-mark question requiring students to draw and label a neat diagram of the water cycle, showing all its important stages.

5. Why is groundwater often considered more important than surface water for human consumption?

This is a higher-order thinking question. Groundwater is often considered more crucial than surface water for several reasons. Firstly, it is naturally filtered as it percolates through layers of soil, sand, and rock, making it relatively free from suspended impurities and pathogens compared to surface water like rivers and lakes. Secondly, groundwater stored in aquifers is less susceptible to seasonal changes and evaporation, providing a more reliable and consistent water source throughout the year, especially in arid regions. Lastly, it is accessible in many areas where surface water is scarce or polluted.

6. How does the construction of concrete roads and buildings in cities impact the water table? Explain the connection.

The construction of concrete roads, pavements, and buildings creates large impermeable surfaces. This prevents rainwater from seeping naturally into the ground. Instead of recharging the groundwater, the rainwater flows into drains and is quickly carried away. This process severely hampers groundwater recharge, which is the natural replenishment of aquifers. Over time, the continuous extraction of groundwater combined with poor recharge leads to a significant and often alarming drop in the city's water table.

7. Differentiate between an aquifer and the water table. Why is this distinction important for Class 7 students?

Understanding the difference is important for exam clarity. The water table is the upper level of the underground surface beneath which the ground is saturated with water. It can rise or fall depending on rainfall and water extraction. An aquifer, on the other hand, is the entire underground layer of water-bearing permeable rock, rock fractures, or unconsolidated materials (like gravel, sand, or silt) from which groundwater can be extracted using a well. In simple terms, the water table is the 'surface' of the groundwater, while the aquifer is the 'container' holding it.