NCERT Solutions for Class 7 Science Chapter 9 Soil is one of the important topics for the students of 7th standard. The solutions for soil are provided here to help students in not only clearing their doubts but also to understand the chapter in an easy and more effective way.
The soil has massive applications; knowing more details about soil will help the students to face the exam confidently and to score good marks in the CBSE Class 7 examination. We present various true and false, MCQ type questions regarding the classification of changes. Here, the chapter-wise NCERT Solutions are also available in PDF format, which students can access and download easily.
1. In addition to the rock particles. The soil contains
i) Air and Water
ii) Water and Plants
iii) Minerals and Organic matter, Air and Water
iv) Water, Air and Plants
Ans : iii) Minerals and Organic matter, Air and Water
2. The water holding capacity is the highest in
i) Sandy soil
ii) Clayey soil
iii) Loamy soil
iv) Mixture of sand and loam
Ans : ii) Clayey soil
3. 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
Ans : i) b ii) c iii) a iv) e v) d
4. Explain how soil is formed?
Ans : Soil has been formed by weathering of parent rock material over millions of years. It is a very slow & gradual process forming fine particles of soil.
5. How is Clayey soil useful for crops?
Ans : Clayey soils are very useful for crops because, these soils :
a) Contain humus, providing fertility to the soil.
b) Hold sufficient water due to the presence of smaller particles.
6. List the differences between clayey soil & sandy soil
Ans :
Sandy soil Clayey soil
1) It contains greater proportion of big 1) It contains greater proportion of fine particles
particles
2) Particles are loosely packed 2) Particles are tightly packed
3) Large space is present between particles 3) Very less space is present between particles
4) Water holding capacity is very less 4) Water holding capacity is maximum
5) Sandy soil is well aerated 5) Clay is not well aerated
6) Water can drain quickly through particles 6) Water cannot drain quickly through particles
7. Sketch the cross section of soil and label the various layers
Ans :
8. Razia conducted an experiment in the field related to the rate of percolation she observed that it took 40 mins for 200 ml of water to percolate through the soil sample. Calculate the rate of percolation.
Ans : Formula of percolation rate
9. Explain how soil pollution & soil erosion could be prevented
Ans : Polyethene bags are made up of plastics that pollute the soil other substances which pollute the soil are a number of waste products, like chemicals & pesticides. So to prevent the soil pollution.
Prevention of soil pollution :
1) There should be a ban on polyethene bags & plastics
2) Waste products & chemicals should be treated before they are released into the soil
3) The use of pesticides should be minimized
Prevention of soil erosion : It can be done by
a) Planting of trees
b) Protecting of forests
c) Holding suitable material (or) organic matter in proper amounts.
d) Maintaining porous structure of soil
e) Control & reclamation of streaks & shifting of cultivation
10. Solve the following cross word puzzle with the clues given:
Ans :
- cross Down
2) Plantation prevents it 1) In desert, soil erosion occurs through
5) Use of these should be banned to avoid
soil pollution 3) Clay and loam are suitable for cereals like
6) Type of soil used for making pottery 4) This type of soil can hold very less water
7) Living organism in the soil 5) Collective name for layers of soil
Important topics covered in NCERT Solutions for Class 7 Science Chapter 9 Soil
- Soil teeming with life
- Soil profile
- Soil types
- Properties of soil
- Moisture in soil
- Absorption of water by soil
- Soil and crops
These solutions for Chapter 9 are created by subject experts according to the latest CBSE syllabus (2020-2021). Students must practise the solutions regularly to prepare effectively for their examination.
These NCERT Solutions for Class 7 Science will help students in revising all the chapters so that they can increase their knowledge of Science.
Stay Tuned to BYJU’S for NCERT Solutions for Class 4 to Class 12.
Frequently Asked Questions on NCERT Solutions for Class 7 Science Chapter 9
List out the concepts discussed in the Chapter 9 of NCERT Solutions for Class 7 Science.
The concepts discussed in the Chapter 9 of NCERT Solutions for Class 7 Science are –
1. Soil teeming with life
2. Soil profile
3. Soil types
4. Properties of soil
5. Moisture in soil
6. Absorption of water by soil
7. Soil and crops
Discuss the usefulness of clayey soil for crops covered in the Chapter 9 of NCERT Solutions for Class 7 Science.
The usefulness of clayey soil for crops covered in the Chapter 9 of NCERT Solutions for Class 7 Science are –
1. Clayey soil has good water holding capacity.
2. Rich organic matter is present in clayey soil.
3. Loamy and clayey soils are suitable for growing cereals like wheat.
4. Growth of crops like paddy is possible in clayey soil as the water holding capacity is more.
Explain the prevention of soil pollution and soil erosion from the Chapter 9 of NCERT Solutions for Class 7 Science.
The following measures can be used to prevent soil pollution.
1. Use of plastics should be reduced.
2. Use of chemical fertilizers and pesticides should be reduced.
The following measures can be used to prevent soil erosion.
1. More trees and plants should be planted to reduce soil erosion.
2. Deforestation should be stopped and overgrazing of animals should be avoided.
