Q:
Tick the most suitable answer. The water holding capacity is the highest in (i) sandy soil (ii) clayey soil (iii) loamy soil (iv) mixture of sand and loam
A:
The water holding capacity is the highest in (ii) clayey soil.
Q:
Tick the most suitable answer. In addition to the rock particles, the soil contains (i) air and water (ii) water and plants (iii) minerals, organic matter, air and water (iv) water, air and plants
A:
In addition to the rock particles, the soil contains (iii) minerals, organic matter, air and water.
Q:
Razia conducted an experiment in the field related to the rate of percolation. She observed that it took 40 min for 200 mL of water to percolate through the soil sample. Calculate the rate of percolation.
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
Q:
List the differences between clayey soil and sandy soil.
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. |
Q:
How is clayey soil useful for 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.
Q:
Explain how soil pollution and soil erosion could be prevented.
A:
Ways of preventing soil pollution are as follows:
- Minimising the use of pesticides and fertilisers
- Banning the use of polythene
- Treating chemicals and other waste products of industries before releasing them into soil or water
- Abandoning the practice of defecation in open
Ways of preventing soil erosion are as follows:
- Planting of trees at large scale
- Putting check on deforestation
- Protecting and expanding forest covers
Q:
Sketch the cross section of soil and label the various layers.
A:
Following is the well-labelled sketch of the cross-section of soil and its various layers:
Q:
Explain how soil is formed.
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.
Q:
Solve the following crossword puzzle with the clues given: Across 2. Plantation prevents it. 5. Use should be banned to avoid soil pollution. 6. Type of soil used for making pottery. 7. Living organism in the soil. Down 1. In desert soil erosion occurs through. 3. Clay and loam are suitable for cereals like. 4. This type of soil can hold very little water. 5. Collective name for layers of soil.
A:
The correctly solved crossword puzzle is as follows:
Q:
Match the items in Column I with those in Column II:
| Column I | Column II |
| (i) A home for living organisms | (a) Large particles |
| (ii) Upper layer of the soil | (b) All kinds of soil |
| (iii) Sandy soil | (c) Dark in colour |
| (iv) Middle layer of the soil | (d) Small particles and packed tight |
| (v) Clayey soil | (e) Lesser amount of humus |
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
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
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?
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.
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 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.
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.
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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