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Solutions ⇒ Class 7th ⇒ Science ⇒ 9. Soil

Solutions 9. Soil - Additional Questions With Solutions | Class 7 Science - Toppers Study

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9. Soil

| Additional Questions With Solutions |

Solutions 9. Soil - Additional Questions With Solutions | Class 7 Science - Toppers Study


Additional Questions With Solutions


Ques: What is humus?
Ans: The rotten death material presence in soil is known as humus.

Ques: what is weathering?
Ans: The breaking down of rocks by the action of wind, water, and climate. This process is called weathering.

Ques: which are those factors which influence the nature of soil?
Ans:
(i)   Rocks from which it has been formed.
(ii)  Vegetation that grows in it.

Ques: What is soil profile?
Ans: A vertical section through different layers of the soil is called the soil profile.

Ques: What are Horizons?
Ans: Each layer differ in feel (texture), colour, depth and chemical composition. These l-ayers are referred to as horizons.

Ques: why is the uppermost horizon generally dark in colour?
Ans: As it is rich in humus and minerals.

Ques: Name the layer of the soil which makes the soil fertile.
Ans: Humus.

Ques: What is topsoil?
Ans: The upper layer is generally soft, porous and can retain more water; it is called the topsoil or the A-horizon.

Ques: In how many layers has soil profile been divided?
Ans: Soil profile has been divided in four layers.
(i)   topsoil or A-horizon
(ii)  B-horizon

  1. C-horizon
  2. Bedrock

Ques: What is called the layer of soil profile which is hard and difficult to dig?
Ans: Bedrock

Ques: What is soil?
Ans: The mixture of rock particles and humus is called the soil.

Ques: What are various classifications of soil?
Ans: The classifications of soil.

  1. Sandy soil.
  2. Clayey soil.
  3. Loamy soil.

Ques: Write three properties of sandy soil.
Ans:

  1. Sandy soils tend to be light.
  2. It is well aerated.
  3. It is rather dry.

Ques: Name the some important climatic factors which affect the soil profile and bring changes in the soil structure.
Ans: Soil is affected by the wind, rainfall, temperature, light and humidity etc.

Ques: What is percolation?
Ans: Absorbing water by the soil is known as percolation.

Ques: What is soil erosion?
Ans: The removal of land surface by water wind or ice is known as soil erosion.

Ques: Explain how soil is formed?
Ans: The soil is formed by the breaking down of rocks by the action of wind, water and climate.

Ques: List the differences between clayey soil and sandy soil.
Ans:

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Ques: How is clayey soil useful for crops?
Ans: Clayey soil is useful for crops, because they are rich in humus and are very fertile. 

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Solutions ⇒ Class 7th ⇒ Science
1. Nutrition in Plants
2. Nutrition in Animals
3. Fibre to Fabric
4. Heat
5. Acids, Bases and Salts
6. Physical and Chemical Changes
7. Weather, Climate and Adaptations of Animals to Climate
8. Winds, Storms and Cyclones
9. Soil
10. Respiration in Organisms
11. Transportation in Animals and Plants
12. Reproduction in Plants
13. Motion and Time
14. Electric Current and its Effects
15. Light
16. Water : A Precious Resource
17. Forests: Our Lifeline
18. Wastewater Story

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