CBSE Class 7 Science Soil Assignment Set A

Read and download free pdf of CBSE Class 7 Science Soil Assignment Set A. Get printable school Assignments for Class 7 Science. Class 7 students should practise questions and answers given here for Chapter 9 Soil Science in Class 7 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 7 Science prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 7 Science Chapter 9 Soil

Class 7 Science students should refer to the following printable assignment in Pdf for Chapter 9 Soil in Class 7. This test paper with questions and answers for Class 7 Science will be very useful for exams and help you to score good marks

Chapter 9 Soil Class 7 Science Assignment

 

I. Fill in the blanks:-

1. Water seeps __________ through sandy soil than clayey soil.

2. Soil is formed by __________ of rocks.

3. _______ soil is formed in tropical countries.

4. _______ soil is found in Gujarat.

II Choose the correct option:-

1. The smallest particles of soil are called

(a) Clay

(b) Sand

(c) Silt

(d) Gravel

2 The hard layer of rocks below the C horizon is called

(a) Bottom Rock

(b) Substratum

(c) Bed Rock

(d) Gravel

3 The Decomposition of Organic matter forms

(a) Humus

(b) Coarse soil

(c) sandy soil

(d) all

4 A protozoan which help to improve the fertility of soil is

(a) Algae

(b) Fungi

(c) Amoeba

(d) bacteria

III Name the following:-

1. Soils which are light and easy to plough.

2. Living Organisms in the soil are referred as.

3. Soil formed by weathering of volcanic rocks.

4. Soil made up of sand ,silt and clay particles which is best for the growth of plants.

IV Define the following :

1 Lateritic soil

2. Alluvial soil

V Draw the following diagrams:

1. Structure of clayey soil

2. Layers of soil

 Soil
 
Soil is one of the most important natural resources. It is the uppermost layer of earth’s crust which is blackishbrown in colour. Major functions of the soil are:
 
• It supports plant growth by holding the roots firmly and supplying water and nutrients to the plants.
 
• It acts as a natural habitat for many organisms like an earthworm, fungi, bacteria, ants, etc.
 
• It is also essential for agriculture which provides us with food, clothing and shelter for all.
 
• It supplies water and nutrients to plants.
 
Therefore, we can say that soil is an inseparable part of our life.
 
Soil Teeming with Life
 
Soil contains air, water and countless living organisms like fungi, bacteria, insects (like ants and beetles), earthworms, rodents, moles and plant roots. Some organisms are too small that they cannot be seen by naked eyes (e.g. fungi
and bacteria). An important soil organism is an earthworm, it is visible only in the rainy season. It increases the fertility of soil. An analysis of different soil samples is summarised in the table given below:

 7th, SCIENCE, 27-07-2021 1

Soil Pollution
 
Sometimes people throw polythene bags and plastic articles in the soil. They pollute the soil and also hill the useful organisms living in the soil. Some other substances like chemicals and pesticides also pollute the soil.To prevent the soil pollution, the use of polythene bags must be banned, and the waste products and chemicals must be treated before they are released into the soil.The use of pesticides in the agricultural field must also be minimised in order to prevent soil pollution.
 
Soil Profile
 
Soil is formed by breaking down of rocks by the action of wind, water or climate by the process called weathering. During this process, the rocks are worn away to form small particles by long exposure to the elements of weather.
 
Weathering is a very slow process as it takes thousands of years for a huge rock to turn into fine particles. The nature of the soil depends upon the rocks from which it has been formed and types of vegetation that grow on it.
The soil profile is a vertical section through different layers of the soil.
Soil profile consists of different layers of soil which are called horizon. Each horizon differs in texture, colour, depth and chemical composition. Different horizons of the soil are discussed further.

Soil

1. A-Horizon or Topsoil
 
It is the uppermost layer of soil and is usually dark in colour because of the presence of minerals and humus in it. It provides the nutrients in plants since the roots of most plants are confined to this layer.Humus is the dark brown coloured layer which consists of dead, rotting remains of plants and animals.

 7th, SCIENCE, 27-07-2021 2

Humus helps in making the topsoil porous. This layer is generally soft and retains more water in it.This layer provides shelter for many living organisms like earthworm, rodents, moles and beetles.
 
2. B-Horizon or Subsoil
 
This layer of soil lies just below the topsoil. It is made up of slightly bigger rock particles than that of the topsoil. It does not have much humus and is lighter in colour than topsoil. It is somewhat harder and more compact than the topsoil. This layer is less fertile than topsoil and contains few living organisms. The subsoil is rich in minerals and iron oxides.
 
3. C-Horizon or Substratum
 
The layer of soil which lies just below the subsoil is called C-horizon. It consists of small pieces of broken rocks with cracks and crevices, formed by the weathering of bedrock or parent rock.
 
4. Bedrock or Parent Rock
 
Below the C-horizon unweathered solid rock is found which is called as bedrock. It is non-porous and can produce the soil over a long period of time. Rainwater gets collected over it to form the water
table.
This layer is hard enough and is difficult to dig with a spade.
 
 
Properties of Soil
 
Soil possesses various properties like:
 
•  It contains air.
•  It can hold water or moisture.
•  It can absorb or soak water
•  It allows water to pass down through it.

 

Please click the link below to download CBSE Class 7 Science Soil Assignment Set A

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CBSE Class 7 Science Chapter 9 Soil Assignment

We hope you liked the above assignment for Chapter 9 Soil which has been designed as per the latest syllabus for Class 7 Science released by CBSE. Students of Class 7 should download and practice the above Assignments for Class 7 Science regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 7 Science practice sheet in Pdf. All questions have been designed for Science by looking into the pattern of problems asked in previous year examinations. 

Assignment for Science CBSE Class 7 Chapter 9 Soil

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Chapter 9 Soil Assignment Science CBSE Class 7

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Chapter 9 Soil Assignment CBSE Class 7 Science

Regular assignment practice helps to get a more comprehensive understanding of Chapter 9 Soil concepts. Assignments play a crucial role in understanding Chapter 9 Soil in CBSE Class 7. Students can download all the assignments of the same chapter in Class 7 Science in Pdf format. You can print them or read them online on your computer or mobile.

CBSE Science Class 7 Chapter 9 Soil Assignment

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The Chapter 9 Soil Class 7 Science Assignments have been designed based on latest CBSE syllabus for Class 7 Science issued for the current academic year

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