The water holding capacity is the highest in (ii) clayey soil.
In addition to the rock particles, the soil contains (iii) minerals, organic matter, air and water.
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
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. |
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.
Ways of preventing soil pollution are as follows:
Ways of preventing soil erosion are as follows:
Following is the well-labelled sketch of the cross-section of soil and its various layers:
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.
The correctly solved crossword puzzle is as follows:
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 |
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 |
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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