Important Questions Class 7 Science Chapter 16

Important Questions Class 7 Science Chapter 16 – Water: A Precious Resource

Science today is much more than learning and memorising the facts. Hence it becomes imperative to strengthen your concepts in Science. Class 7 Chapter 16 is about Water: A Precious Resource. This chapter explains the various forms of available water, the importance and distribution of groundwater, agricultural water management using drip irrigation and rainwater harvesting etc. This chapter also deals with the outcomes of wasting water and the scarcity of water.

Students studying Science should start by going through the Class 7 Science NCERT books and then solving Important Questions Class 7 Science Chapter 16. Science is a practical subject, so along with learning the theoretical aspect, students may strengthen their understanding by solving various questions from the NCERT books. To ace the examination, students must also go through Extramarks study materials, including NCERT solutions, CBSE chapter notes, and Important Questions Class 7 Science Chapter 16. 

At Extramarks, we understand the importance of solving important questions and we take our role seriously to provide the best resource to the students and help them get excellent grades. We provide students with a list of important questions from the CBSE syllabus. Extramarks  Science faculty experts   refer to the NCERT textbook and exemplar, other important reference books, CBSE sample papers, CBSE past years’ question papers, etc., for compiling a list of questions. Solving many questions given in our Important Questions Class 7 Science Chapter 16 can prepare the students to face questions of graded difficulty level  with ease in their examinations.

Extramarks believes in incorporating happy and joyful learning experiences through its own repository of resources. To get the maximum benefit during exam preparations, students can register at Extramarks and access Science Class 7 Chapter 16 Important Questions, NCERT solutions, revision notes, and other study materials.

Important Questions Class 7 Science Chapter 16 – With Solutions

Given below are a few questions and their answers from our question bank of Important Questions Class 7 Science Chapter 16.

Question 1. What is the water table?

Answer 1. The water table is the topmost layer of the soil or earth below which the soil is constantly saturated with water. Water is generally present below the water table. The level of the water table  differs from place to place and may change over a period of time.

Question 2. What is Rain Water Harvesting?

Answer 2. Rainwater Harvesting is a procedure of collecting rainwater and using it to recharge groundwater. Rainwater that falls on the ground, rooftops, and other surfaces is channelled through a system of pipes. This water may be temporarily stored or allowed to permeate the soil and recharge groundwater.

Question 3. How does the groundwater get recharged?

Answer 3. The rainwater and the water from other resources such as rivers and ponds seep through the soil and fill the empty spaces and cracks deep below the ground. The process of seeping water within the ground is known as infiltration. The groundwater thus gets rejuvenated by this process.

Question 4. Describe the factors responsible for the depletion of the water table.

Answer 4. Factors that are responsible for the depletion of the water table are as follows-

i) Increase in population- Increase in population leads to increased demand for water for domestic and drinking purposes. It reduces the water table.

ii) Industrialisation- Industries need a lot of water for manufacturing purposes. It reduces the water table.

iii) Agriculture- Agriculture requires a lot of water for growing crops; this results in the depletion of the water table.

Question 5. Choose the correct answer. The total water

(i) in lakes and rivers of the world remains constant.

(ii) below the ground remains constant.

(iii) the seas and oceans of the world remain constant.

(iv) of the world remains constant.

Answer 5. The correct answer is an option (iv) of the world remains constant.

Question 6. Suppose there are ten tube wells in a lane of fifty houses. What could be the long-term impact on the water table?

Answer 6. If ten tube wells in a lane of fifty houses are situated, the groundwater will get used for domestic purposes. It results in depletion of groundwater levels, and the water table will drop as a result. .

Question 7. Which among the following does not show water shortage?

(a) Taps running dry.

(b) Long queues for getting water.

(c) Marches and protests for the water demand.

(d) A family gets 3 buckets of water per person daily.

Answer 7. A correct answer is option (d). A family gets 3 buckets of water per person per day.

Explanation: The United Nations recommends 50 litres of daily water per person. If a family gets 3 buckets of water daily, it does not show the  water shortage.

Question 8. Define groundwater. What are the water sources which are sustained by groundwater?

Answer 8. Water available below the water table is called groundwater.

Sources of Groundwater- The rainwater and water from other sources such as rivers and ponds seep through the soil and fill the empty spaces and cracks deep below the ground. The process of seeping water within the ground is called Infiltration. The groundwater thus gets rejuvenated by this process. In places, the groundwater is stored between layers of hard rock below the water table. This is known as an aquifer. Water in the aquifers can usually be pumped out with the help of tube wells or hand pumps.

Question 9. Water is very valuable for all living organisms. What will happen in future if water is not saved now?

Answer 9. Water is crucial for all living beings. There can be no life without water. If we do not save water now, we face the scantiness of water, and it may lead to the following consequences.

1. Daily activities will become very hard with the shortage of water.
2. Agriculture will be affected, resulting in an insufficient supply of food production.
3. People would have to get water at high prices especially drinking water.
4. People may drink dirty (contaminated) water, which may lead to water-borne diseases such as cholera. Due to water scantiness, sufficient water will not be available to plants. Plants need water to prepare their food through the process of photosynthesis. If water is unavailable to plants, the green cover will reduce at a very vast pace and eventually disappear.. It may mean the end of life, for the world without plants will have no food, no oxygen, no rain, and leading to a host of innumerable problems.

Question 10. A few definitions are given below, which can be corrected by changing one word. Correct them.

(a) An aquifer is a groundwater stored between layers of hard rock above the water table.

(b) The water evaporation process in the ground is called Infiltration.

(c) Evaporation of water from oceans and its arrival back into oceans is called the vapour cycle.

Answer 10. a) An aquifer is groundwater stored between layers of hard rock below the water table.

b) The process of seeping water into the ground is called infiltration.

c) The evaporation of water from oceans and its arrival back into oceans is called the water cycle.

Question 11. Water is a universal solvent. Explain.

Answer 11. Many substances dissolve in water, so it is called a universal solvent. A solvent is a liquid that dissolves another substance (solute) to form a solution.

Question 12. How is the cloud formed?

Answer 12. The evaporated water above the earth’s surface is moved away by hot air. As the hot air moves higher from the surface of the Earth, it starts to cool down. The water vapour present starts to condense to form small water droplets. These droplets float in the atmosphere and form clouds.

Question 13. What is precipitation?

Answer 13. When clouds rub together, heat has produced that melt the cloud into droplets. These droplets condense to form bigger drops of water. Some of these drops may become too heavy to fall as rain. This process is known as precipitation.

Question 14. Enlist some methods to conserve water.

Answer 14. Water conservation is preventing wastage of water, using water carefully and recharging groundwater. Water conservation can be done by

i) Repairing leaking pipes and taps.

ii) Not wasting water while brushing teeth, shaving, bathing, washing clothes, and other activities.

iii) Rainwater harvesting.

iv) By drip irrigation.

Question 15. What are the main reasons for the depletion of the water table?

Answer 15. Increasing population, urbanisation, industrialisation, and agriculture are the primary causes of water table depletion.

i) Population Explosion- The term “population explosion” refers to a rapid increase in population. As the population grows, our reliance on all resources, including water, also increases. The amount of water on the earth is limited, but the need is constantly increasing. As a result, we are consuming more and more groundwater without permitting enough time to recharge, resulting in its depletion.

ii) Urbanisation- Increased urbanisation and changing lifestyles have increased our need for water. Commercialization and a modern lifestyle have made us dependent on things that require a large amount of freshwater to produce. It reduces the amount of groundwater available.

iii) Industrialization- As the world’s population grows and lifestyles change, new industries emerge to meet our needs and desires. Most industrial processes use a lot of water, depleting the groundwater supply.

iv) Agriculture- Plants need a lot of water to grow; hence it is said that agriculture is a water-reliant industry. The need for water is more for some plants than it is for others. In India, most agriculture still relies on rain (rain-fed agriculture). Rainstorms, on the other hand, are irregular and unpredictable. Consequently, more groundwater is being used to make water available for agriculture, further depleting its levels.

Question 16. What is the use of bawris in water management?

Answer 16. Bawris is also known as step wells and is a traditional rainwater collecting device. People use this approach to dig extremely deep step wells in the ground. These step wells fill up with water when it rains. Since it is so deep, evaporation is minimal. As a result, water may be stored for a longer time in these wells and utilised in times of scarcity.

Question 17. What do you understand about drip irrigation? Explain its significance.

Answer 17. Drip irrigation is a type of irrigation that farmers use to save water and manage limited water more efficiently. A network of narrow tubes is put throughout the field with holes that open towards the base of the plants in drip irrigation. The tubes are connected to a water supply source. When water is pumped, the tubes send water only to the plant’s base, not the entire field, ensuring water is used efficiently.

Question 18. When is World Water Day celebrated? What is its significance?

Answer 18. World Water Day is celebrated on the 22nd of march every year. This initiative draws attention to the world’s depleting water resources and the need to conserve them.

Question 19. What is the minimum amount of water recommended by the UN per day?

Answer 19. The United Nations recommends that each person use 50 litres of water daily, including drinking, cooking, washing, and basic sanitation.

Question 20. Which year was the International Year of Freshwater, and what was its significance?

Answer 20. The year 2003 was declared the International Year of Freshwater to raise awareness about dwindling freshwater supplies and the need for conservation.

Benefits of solving Important Questions Class 7 Science Chapter 16:

Science is an essential foundational subject in Classes 6,7, and 8 for students planning to pursue their careers in scientific-oriented education streams. The way of teaching science that gives students hands-on experience to develop scientific literacy helps their correct understanding of the concepts to  pursue higher education and future career prospects. Much practice and effort should go towards understanding the core components of Science. Going through the Important Questions Class 7 Science Chapter 16 available on the Extramarks can help students to reflect on their own learning and try to find answers instead of just cramming the concepts will benefit them greatly while solving questions and enhancing their learning experience. 

Here are a few benefits students can achieve while revising the Important Questions Class 7 Science Chapter 16 available at Extramarks. 

• Get a list of all the chapter 16 class 7 science important questions in one place. The list would include questions from NCERT books, past years’ question papers, and other reference books, providing a thorough revision of the entire chapter.
• The solutions have been prepared by Extramarks’ team of subject matter experts with years of experience. So students can rely on the solutions completely. . Our team has given step-by-step solutions that help students revise important theoretical concepts used in solving specific problems.
• The questions covered in the Class 7 Science Chapter 16 Important Questions list include a comprehensive list of questions from the entire chapter, ensuring that solving them helps with the revision of the whole chapter.
• In order to make this learning process more interesting and enjoyable within the limited timeframe, subject matter experts at Extramarks had to dig deeper to restructure the information into different formats to enable a smooth and deep learning experience so that students need not look elsewhere for any other reference material.

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For students in Classes 1 through 12, Extramarks offers high-quality resources such as NCERT revision notes, CBSE sample papers, CBSE past years’ question papers, CBSE additional questions, CBSE mock tests, etc. To access some of these resources, students must click on the website links provided below:

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