Class 7th Science - Soil Science. Chapter-9 (SA & FA)

Science Assignment (Based on FA & SA) VII CLASS – Science Lesson-9 (Soil Science)

Class 7th Science Assignment FA & SA

Ques-1 Write the two components of soil? 

Ans. The two components of soil are humus and rock particles.

Ques-2 What is humus? 

Ans. The rotting dead matter in the soil is called humus.

Ques-3 What is the soil profile? 

Ans. A vertical section through different layers of soil is called soil profile.

Ques-4 Why is loam considered to be the best topsoil for growing plants?

Ans. Loamy soil has humus in it that is why loam considered to be the best topsoil for growing plants. For the growth of plants, it has water holding capacity.

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Ques-5 How can we prevent soil erosion?

Ans. We can prevent soil erosion by planting more trees, deforestation should be prevented.

Ques-6 Why do we find a good amount of humus in topsoil than subsoil? 

Ans. We find a good amount of humus in topsoil than subsoil because topsoil is soft, porous and retain more water then subsoil. So, many living organisms live in it. Small plants are embedded and entirely in the topsoil.

Ques-7 Why is sandy well aerated? 

Ans. Particles of sandy soil are big, they cannot fit closely together, there are large space between them. So these spaces filled with air.

Ques-8 What are the characteristics of A- horizon? 

Ans. A-horizon or topsoil is generally soft, porous and retain more water. It provides shelter to many organisms. It is rich in humus. 

 

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Class 7th Science - Soil Science. Chapter-9 (SA & FA)

Science Assignment (Based on FA & SA) VII CLASS – Science Lesson-9 (Soil Science)

 

Class 7th Science Assignment FA & SA

Ques-9 Name some living organisms present in the soil? 

Ans. Worms, rodents, moles and beetles.

Ques-10 Which horizon of soil is difficult to dig with spade? 

Ans. The third C-horizon is made up of small rocks with cracks and crevices, below the layer is bad rock.

Ques-11 Write the formula of percolation rate? 

Ans. The formula of percolation rate is amount of water (ml)/Percolation time (min)

Ques-12 Which type of soil has highest percolation rate?

Ans. Sandy soil has soil has highest percolation rate.

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Ques-13 What is soil erosion?

Ans. Removal of soil from land surface by water, wind or ice is known as soil erosion.

Ques-14 How soil is an inseparable part of our life? 

Ans. Soil is an inseparable part of our life because plants grow on soil and we all depend in plants for our food.

Ques-15 What kind of soil is used to make matkas, surahi etc.? 

Ans. Black soil is used to make matkas, surahi etc.

Ques-16 Why clayey soil feels smooth in touch? 

Ans. Particles of clayey soil are very fine and well aerated. They are very light. So, it feels smooth in touch.


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