NCERT Solutions for Class 7 Science Chapter 9: Soil

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NCERT Solutions for Class 7 Science Chapter 9 Soil are provided in this article. Key concepts covered in this chapter are:

Soil Profile
Soil Types
Properties of Soil
Moisture in Soil
Absorption of Water by Soil

Download PDF: NCERT Solutions for Class 7 Science Chapter 9 Soil

NCERT Solutions for Class 7 Science Chapter 9

NCERT Solutions for Class 7 Science Chapter 9 Soil are given in the following PDF:

NCERT Solutions

Class 7 Science Chapter 9 Soil: Important Topics

Soil is a material found on most of the surface of earth comprised of organic matter, minerals, gases, liquids, and organisms that together support life. It is composed of mineral particles, organic materials, air, water, and living organisms—all of which interact slowly yet constantly.

Soil Profile

Soil profile is referred to as as the vertical section of the soil from the ground surface downwards to where the soil meets the rock. It helps to examine the structure of soil. A soil profile is divided into layers which are known as horizons. The main soil horizons are A, B, C, and D.

The layers of soil can be identified by the soil colour as well as by the size of soil particles. The different layers of soil are:

Topsoil
Subsoil
Parent rock

Soil Types

A soil type is referred to as a taxonomic unit in soil science. All soils that share a certain set of well-defined properties form a distinctive soil type.

Soil is classified into four types:

Sandy soil
Silt Soil
Clay Soil
Loamy Soil

Properties of Soil

The physical properties of soil include texture, structure, density, porosity, consistency, temperature, and color.

Soil texture
Soil structure
Soil density
Soil porosity
Soil consistency (plasticity)
Soil temperature

Chapter Related Links:

Agriculture Seeds Selection Sowing	Agriculture Soil	Cyclone
Weathering	Pressure system	Tornado Bottle

Class 7 Science Additional Resources:

CBSE Class 7 Science NCERT Textbook	CBSE Class 7 Science Sample Paper	NCERT Solutions

CBSE X Related Questions

1.
(a) Study the given electric circuit in which 2 A electric current is flowing between points X and Y.

(i) Using the battery, key, voltmeter and ammeter in this given electric circuit, redraw a circuit diagram in which 2 \(\Omega\) and 4 \(\Omega\) resistors are connected between X and Y in parallel combination.
(ii) Circuit drawn by you, in which resistors are connected in parallel combination, calculate the electric current flowing through 4 \(\Omega\) resistor.
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2.
The reasons for excessive generation of wastes are:
(i) Use and throw policy.
(ii) Increased availability of packaged food.
(iii) Increased construction wastes.
(iv) Non-sorting of dry and wet wastes
- (i), (iii) and (iv)
- (i), (ii) and (iii)
- (i), (ii), (iii) and (iv)
- (ii), (iii) and (iv)
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3.
How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?
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4.
Due to change in length and area of cross-section of a conductor, resistance of conductor changes while resistivity does not change. Why ?
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5.
When you look at an object very close to your eyes, the:
- Ciliary muscles of your eye contract and the eye lens becomes thick.
- Ciliary muscles of your eye get relaxed and the eye lens becomes thick.
- Ciliary muscles of your eye contract and the eye lens becomes thin.
- Ciliary muscles of your eye get relaxed and the eye lens becomes thin.
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6.
State two differences between the act of chewing food and salivation on sight of food.
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