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Chapter soil erosion and conservation full for students

Soil and conservation

Solved chapter


One word



Ques-1 The uppermost layer of soil is called____.

Ans- Topsoil


Ques-2 ____is non- porous layer of soil?

Ans- Bedrock.


Ques-3 Growing trees on a large number is called ___.

Ans- Afforestation.


Ques-4. Which of the river is known as 'Sorrow of China'?


Ans- Yellow river.


Ques-5 Which of the layer is rich in minerals? 

Ans- Subsoil.



 Very short



Ques-1 Name the three layers of soil 

Ans- Topsoil, subsoil, bedrock 


Ques-2 What is weathering?

Ans- The process of formation of soil is called weathering.


Ques-3. What is deforestation?


Ans- cutting of forest is known as deforestation.


Ques-4. What is terrace farming?


Ans- farming is done by cutting the slopes into steps or terrace is called terrace farming.


Ques-5. What is soil erosion?

Ans- The carrying away of soil by the action of wind and water is known as soil erosion.



Short


Ques- 1. How does human activities responsible for soil erosion?

Ans- human beings are responsible for soil erosion due to their activities such as:-

  1. large areas of forests are cut to meet the demand of wood and to create human settlements

  2. Overgrazing by cattle makel the land barren.

  3. Ploughing loosen the soil.




Ques-2 why do some river change their course?


Ans- River carries a lot of soil with it. it leaves some part of the soil on its way. with the passage of time, the soil accumulates and the river has to change its course.



Ques-3 explain the process of formation of soil.

Ans- The rock break into small pieces that become smaller when rubbed by wind and water. The tiny particles make clay and the medium sized particles from silt whereas larger particles from sand.




Long



Ques-1 what is soil conservation? describe any two methods of soil conservation.

Ans- soil conservation- The protection of soil is called soil conservation.

Two methods of soil conservation are as follow:-

  1. Constructions of dam:- floods causes a great loss to the topmost layer of the soil. hence, dams and embankments should be built along river banks

  2. Terrace farming:- on hill slopes farming is done by cutting the slope into steps or terrace. this reduces slopes length and reduce energy of water. Also, roots hold the top soil thus reducing erosion.



Ques-2 write a short note on soil and its layer with diagram.

Ans- soil is the foundation of life on the earth it supports plants and animals life.

It takes millions of years to formation.

It has three layers:- 


  1. Topsoil-  the uppermost layer is called topsoil. it is rich in humus and it is important for growing plants.

  2. Subsoil-.  it is just below the topsoil and it is rich in minerals and also contains the parent materials from which the soil is developed.

  3. Bedrock-.  It is a non- porous layer of soil and It is just below the subsoil.



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