NCERT Solutions for Class 7 Science Chapter 16 : Water: A Precious Resource


Which one of the following is not responsible for water shortage? (i) Rapid growth of industries (ii) Increasing population (iii) Heavy rainfall (iv) Mismanagement of water resources


(iii) Heavy rainfall


Make a sketch showing groundwater and water table.Label it.


Following sketch shows groundwater and water table:


Choose the correct option. The total water (i) in the lakes and rivers of the world remains constant. (ii) under the ground remains constant. (iii) in the seas and oceans of the world remains constant. (iv) of the world remains constant.


The total water (iv) of the world remains constant.


Fill in the blanks with the appropriate answers: (a) People obtain groundwater through________ and ________. (b) Three forms of water are ________, ________ and ________. (c) The water bearing layer of the earth is ________. (d) The process of water seepage into the ground is called ________.


(a) tube wells, hand pumps

(b) ice, water, vapour

(c) Aquifer

(d) Infiltration


You have been asked to maintain a garden. How will you minimise the use of water?


The usage of water required for maintaining a garden can be minimised by using drip irrigation. In this technique, a network of narrow pipes is used for delivering water directly at the base of the plant. This technique prevents wastage of water in watering the garden plants as well as in irrigating the agricultural fields.


Explain how groundwater is recharged?


Groundwater is recharged by the seepage of water through cracks and gaps present in the layers of soil from rivers, ponds, streams and rainwater. There are small crevices and empty spaces present between the rocks through which rainwater infiltrates, reaches to the water table and replenishes it.


Mark ‘T’ if the statement is true and ‘F’ if it is false: (a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F) (b) Water shortage is a problem faced only by people living in rural areas. (T/F) (c) Water from rivers is the only source for irrigation in the fields. (T/F) (d) Rain is the ultimate source of water. (T/F)


(a) True

(b) False

(c) False

(d) True


There are ten tubewells in a lane of fifty houses. What could be the long term impact on the water table?


Tubewells are used to draw underground freshwater to the surface to meet growing demands of water for domestic, industrial and agricultural consumption. If ten tubewells are installed in a lane of fifty houses, the ground water is drawn out at a faster rate that results in rapid depletion of water table in that area.


Explain the factors responsible for the depletion of water table.


The factors responsible for the depletion of water table are as follows:

  1. Increasing requirements of water due to ever rising population, rapid industrial growth and agricultural activities
  2. Decreasing effective area for seepage of water due to expansion of road networks, townships and cities
  3. Large scale deforestation
  4. Wastage of water
  5. Increased dependence on ground water as a source of freshwater due to pollution of rivers and ponds

Benefits of NCERT Solutions

Following are some of the benefits of using NCERT Solutions by Extramarks.

1. The NCERT solutions for class 7 are prepared keeping in mind the necessary rules and format issued by the CBSE board thus providing students much-needed preview of the exam pattern of questions and preview of the exam that they are going to face during the final exams.

2. The students can be sure about the quality of the solutions as they are committed by highly experienced and expert teachers. These teachers have years of experience and they make sure that there is no mistake committed when preparing the solutions.

3. The NCERT 7 solutions are provided for the questions that are most likely to appear in the exam thus improving the efficiency of the students by helping them prepare for the important parts of the syllabus.

Tips & Strategies for Class 7 Exam Preparation

1. Start your revision early so you can revise well and grasp all the difficult concepts.

2. Organize your study time by making a timetable as it will help you manage your time accordingly.

3. Take mock tests and solve sample papers as they will help you learn time management during the exam and make you familiar with the exam pattern.

4. Take regular breaks, look after yourself by sleeping properly and eating well.

5. Know your exam well, explore the mock tests, and practice sample papers as much as you can.

Why Choose Extramarks CBSE Class 7 Study Materials?

1. The solutions have been compiled keeping in mind the purpose of scoring high marks in exams thus they have everything that the students need to prepare for exams.
2. The NCERT solutions for class 7 are designed in a clear and simple language complete with diagrams so that the students understand the subject well.
3. The NCERT 7 solutions are accurate thus improving their reliability.
4. The solutions are designed by expert and experienced teachers that help in removing all doubts out of the solutions and improving the credibility of the answers.

Frequently Asked Questions

Is class 7 Math NCERT book sufficient for prepare for the exams?

Yes, the NCERT book has been designed keeping in mind the pattern of paper that will be presented in the exam to students. The NCERT book is sufficient to study for the exam as it has everything related to the exam and contains all information out of which the questions will be asked in the exam. But if you want to prepare a little bit extra, we suggest that you go through the NCERT class 7 solutions.

When to refer to NCERT solutions for class 7th?

When you are studying the NCERT book for math and other subjects for your class 7 exams, refer to the NCERT class 7 solutions simultaneously so you can see where you are going wrong and what are you getting right in your exercises’ attempt.

Why are the NCERT solutions important for Class 7th?

The class 7th is very crucial as it is among the major middle school classes during which the child’s base is formed in math and science and even in other subjects like English. Thus, it is students must study smartly in this class and ace their exams while getting all the help they need from the NCERT 7 solutions given by Extramarks.

Can I rely on the NCERT solutions for class 7 Math at Extramarks to perform well in the annual exam?

Yes, absolutely. The NCERT solutions provided by Extramarks for class 7 are eloquent and elaborate at best and are thus useful for students studying for the final exams of class 7. The students will have many questions and doubts regarding the NCERT solutions for class 7 and this is why the solutions have been elaborated well to help students understand the answers to exercises.

Do you provide NCERT solutions for Class 7 Math for free?

Yes, the NCERT solutions for Math and other subjects for class 7 are available for free from Extramarks.

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