CBSE Class 7 Science Soil Worksheet with Solution by Expert Science Mam. Students of 7th Grade can solve this worksheet for extra preparation before exam. Private Teacher or Guardians of the Students can copy all the questions of this chapter and will match after solve their students.
Soil Class 7 Worksheet
Worksheet for Chapter No.9): – Soil
The following questions are important for your exams for 1 mark 2 mark or 5 marks. First solve the questions on your own and then saw the solution for understanding it better.
Practice worksheet for class 7
Section A
Q.1) Define the following?
→ 1.) Weathering
Soil is formed by breaking down of rocks by the action of wind, water and climate this process is called as weathering.
Q.2.) Define the following?
→ 1.) Humus – The rotting dead matter in the soil is called as humus.
2.) Soil profile – a vertical section through different layers of the soil is called as the soil profile.
Q.3.) Explain how soil is formed ?
→ Soil is formed due to weathering of rocks. The physical breakdown and chemical decomposition of minerals takes place by wind water and climatic changes is called as weathering. In weathering process rocks are converted to small pieces which eventually turn to soil particles to form a layer of soil.
Q.4.) Explain the difference between clayey soil and sandy soil?
→
SR.NO. |
Clayey Soil | Sandy Soil |
1 | Particles are finer |
Particles are larger |
2 |
Particles are tightly packed | Particles are loosely packed |
3 | Holds a good amount of water |
Water holding capacity is low |
4 |
It is heavy in weight | It is light in weight |
5 | Rich in humus and organic nutrients |
Not rich in humus and organic nutrients |
6 |
Very little air is trapped between the particles |
More air is trapped between the particles |
Q.5.) Define the following terms?
→ 1.) Clay soil – if soil contains the preparation of fine particles is relatively higher than it is called as clayey soil.
2.) Sandy soil – is soil contains greater proportion of big particles then it is called as sandy soil.
Q.6.) What is loamy soil ?
→ Loamy soil is a mixture of sand, clay and another type of soil particle known as silt. Sil Takers as a deposit in riverbeds.
Q.7.) What is topsoil or A- horizon ?
→ The uppermost horizon is generally dark in colour as it is rich in humus and minerals. The humus Makes the soil fertile and provides nutrient to growing plants and this layer is called as topsoil or the A – horizon .
Q.8.) What is B- horizon ?
→ The middle layer of soil which has lesser amount of humus but more of minerals. This layer is generally harder and more compact and it is called as B-horizon.
Q.10.) Explain the term C- horizon?
→ The layer of soil which is made up of small lumps of rocks with cracks and crevices. This layer is third layer of soil called as c horizon.
Q.11.) What is bedrock?
→ The layer of soil which is below the C horizon it is very hard and difficult to dig with a spade. This layer of soil is called as bedrock.
Q.12.) What is the soil ? Write their types?
→ Soil is a mixture of Rock particles and humus. The soil is classified based on proportion of particles of various sizes.
Types of soil:-
1.) Sandy soil
2.) Clayey soil
3.) Loamy soil
Q.13.) What is soil erosion?
→ The removal of land surface by water, wind or ice is known as erosion. Plant roots firmly bind the soil. In the absence of plants , Soil becomes loose so it can be moved by wind and flowing water. Erosion of soil is more severe in areas of little or no surface vegetation. Such as desert or bare llands
Q.14.) What should we do to reduce soil erosion?
→ 1.) Cutting of trees and deforestation should be prevented to reduce soil erosion.
2.) The effort should be made to increase the green areas.
3.) Trees should be planted as more as possible.
Q.15.) What is soil moisture?
→ Soil holds water in it which is called as a soil moisture. The capacity of a soil to hold water is important for various crops.
Q.16.) How is clayey soil useful for vegetables crops ?
→ The clay soil is useful for the crops-
1.) Clayey soil is rich in organic matter.
2.) It has excellent water holding capacity.
3.) Clayey and loamy soils are suitable for growing cereals like wheat.
4.) What are holding capacity of this soil supports the growth of crops like paddy crops which require more water to grow.
Q.17.) Suman conducted an experiment in an agricultural field to identify the rate of percolation. She observed that it took 30 minutes for 300 ml of water to percolate through the soil sample. Calculate the rate of percolation?
→ Amount of water = 300ml
Percolation time = 30 min.
Percolation rate = amount of water / percolation time in minutes.
= 300 / 30
= 10ml/min.
Q.18.) How soil pollution can be prevented. Explain?
→ Soil pollution can be controlled by following method –
1.) Reduce the use of chemical fertilizers.
2.) Reduce the use of chemical pesticides.
3.) Reduce the use of plastic and do not through plastic as your garbage.
4.) By controlling the industrial waste and the waste coming from chemical factories.
Q.19.) What is percolation of soil ?
→ Percolation is the process of filtering liquid while passing through a filter. Rainfall seeps underground through percolation. Where water travels downwards through the tiny spaces between rocks and soil particles.
Q.20.) Explain percolation rate of soil?
→ 1.) Percolation rate of soil is used to determine the absorption of moisture rate of the soil.
2.) The rate of percolation is the ratio of the amount of water in millimeters to the percolation time in minutes.