NCERT Solutions for Class 7 Science Chapter 9 : Soil

### A:

The water holding capacity is the highest in (ii) clayey soil.

### A:

In addition to the rock particles, the soil contains (iii) minerals, organic matter, air and water.

### A:

The percolation rate is given by the following expression:

Percolation rate = amount of water (mL)/time taken(min)

Therefore, Percolation rate = 200 mL/40min

= 5 mL/min

### A:

The differences between clayey soil and sandy soil are as follows:

 S. no. Clayey soil Sandy soil 1. Soil particles are very fine. Soil particles are very large. 2. Soil particles are compactly bound to each other. Soil particles are not bound to each other. 3. Soil has high water holding capacity. Soil has poor water holding capacity. 4. Soil supports the growth of most of the crops. Soil supports the growth of only few types of crops.

### A:

Clayey soil has maximum water holding capacity due to which it retains water for absorption by the plants for longer period of time. Also, clayey soil is rich in humus that provides nutrients to the plants for their growth. Thus, clayey soil is very useful for the crops.

### A:

Ways of preventing soil pollution are as follows:

1. Minimising the use of pesticides and fertilisers
2. Banning the use of polythene
3. Treating chemicals and other waste products of industries before releasing them into soil or water
4. Abandoning the practice of defecation in open

Ways of preventing soil erosion are as follows:

1. Planting of trees at large scale
2. Putting check on deforestation
3. Protecting and expanding forest covers

### A:

Following is the well-labelled sketch of the cross-section of soil and its various layers:

### A:

Soil is formed by the process of weathering. In this process, rocks are broken into smaller particles by the action of wind, water and various other climatic factors. The slow and continuous action of these factors converts massive rocks into fine particles of soil over a period of millions of years.

### A:

The correctly solved crossword puzzle is as follows:

### A:

The correctly matched contents of Column I and Column II are as follows:

 Column I Column II (i) A home for living organisms (b) All kinds of soil (ii) Upper layer of the soil (c) Dark in colour (iii) Sandy soil (a) Large particles (iv) Middle layer of the soil (e) Lesser amount of humus (v) Clayey soil (d) Small particles and packed tight

### 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.

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.

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.

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

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