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CBSE Questions for Class 7 Chemistry Soil Quiz 2 - MCQExams.com
CBSE
Class 7 Chemistry
Soil
Quiz 2
Which one of the following soil has least water holding capacity?
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Clayey soil
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Loamy soil
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Silty soil
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Sandy soil
Explanation
Sandy soil has the lowest water holding capacity because they have coarse particles with big gaps between them.
Thus, a large amount of water and nutrients easily pass through the particles of sandy soil.
The lower percolation rate refers that the soil:
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Can hold water for less time
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Can hold water for more time
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Cannot hold water
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None of the above
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(B)}$$
$$\textbf{Solution:}$$
$$\bullet$$ The water absorption rate of the soil is measured by its percolation rate.
$$\bullet$$
Soil with lesser percolation has high water retention capacity whereas soil with high percolation has poor water retention capacity.
$$\bullet$$
A lower percolation rate means the soil can store water for a longer period of time, whereas a higher percolation rate means the soil can hold water for a shorter period of time.
$$\textbf{Thus the Correct option is (B)}$$
________ determines thickness of soil profile.
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Climate
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Time
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Relief
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Wind
Explanation
Time determines the thickness of soil profile as many layers of sand, weathered rock, humus gets deposited over the already present soil layer.
The layer of soil richest in humus in the soil profile is the:
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lowermost layer of the soil
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topmost layer of the soil
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middle layer of the soil
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bedrock
Explanation
$$\textbf {Correct Option (B):} $$
$$\textbf {Solution:} $$
$$\textbf {Option (A):} $$
$$\bullet$$
$$\textbf {Option (B):} $$
$$\bullet$$ The topmost layer of soil is rich in humus as all the dead organisms and dead leaves fall on the ground.
$$\bullet$$ This dead matter is decomposed by bacteria and fungi that thrive on dead matter and convert to inorganic matter which we call Humus.
$$\bullet$$ The humus layer retains a lot of moisture and that makes for the great nutritive quality and why plants grow so well in such humus-rich soil.
$$\textbf {Option (C):} $$
$$\bullet$$
$$\textbf {Option (D):} $$
$$\bullet$$
Hence, the option(B) is the correct answer.
The study of the vertical section of the layers of the soil is known as
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Soil study
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Soil profile
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Soil layering
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Soil weathering
Explanation
Soli study refers to the depth study of soil in all its forms.
Soli profile refers to vertical sections of soil. It allows examining the structure of the soil.
The different horizons in the soil profile are regarded as soil layers that are parallel to each other.
The term weathering refers to the breaking down of rocks, soils as well as minerals and woods.
Which of the following represents the use(s) of soil?
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Plant conservation
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Water conservation
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Construction and arts
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All of the above.
Explanation
The soil is used in agriculture, where it serves as the primary nutrient base for the plants. The soil is used in constructions and arts. Soil material is a critical component in the mining and construction industries. Soil serves as a foundation for most construction projects. Massive volumes of soil can be involved in surface mining, road building, and dam construction. Earth sheltering is the architectural practice of using soil for external thermal mass against building walls. Soil is used to make pots. Soil plays an important role in infiltrating and purifying water. After coming down as precipitation, much of the rainwater is percolated through the many horizons of a soil profile and renamed groundwater. As the water moves through different areas such as wetlands, forests, and riparian zones many pollutants are removed. Pollutants such as viruses, oils, metals, excess nutrients, and sediments are filtered out by the soil and surrounding organisms.
The soil which is loosely packed with large air spaces is called as:
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loamy soil
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sandy soil
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clayey soil
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None of these
Explanation
Sandy soil consists of large particles that are loosely packed with large air spaces between them.
Since sand particles are quite large, they cannot fit close together, so there are large spaces between them. These spaces are filled with air.
Water can drain easily
through
________.
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Clayey soil
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Loamy soil
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Sandy soil
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Peat
Soil
Explanation
Due to the large sized particles the sandy soil have small surface area due to which it cannot hold the water.
Which topsoil is useful for plants?
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Loamy soil
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Clayey soil
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Sandy soil
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None of these
Explanation
Loamy soil is useful for the plants because loamy soils have more nutrients, humus, and water holding capacity than the sandy soils. Also, it has better aeration than silt and clayey soils.
Which soil is red in colour?
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Multani soil
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Shadu soil
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Terracotta soil
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Kaolin (china clay)
Explanation
Multani soil is cream-yellow in colour.
Shadu soil is whitish in colour.
Terracotta soil is red in colour.
Kaolin (china clay) is white in colour.
The rotting dead matter in the soil is called_________.
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humus
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loamy
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clay
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bedrock
Explanation
Humus is an organic component of soil formed by the decomposition of leaves and other plant material or rotting dead matter by soil microorganisms.
Which soil is used to make decorative articles and pots used for growing plants?
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Multani soil
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Terracotta soil
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Shadu soil
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Kaolin (china clay)
Explanation
Multani soil is used in cosmetics.
The terracotta soil is used to make decorative articles and pots used for growing plants.
Shadu soil is used for making statues and idols.
Kaolin (china clay) is used to make crockery, bathroom tiles, tanks, laboratory apparatus, masks, jars etc.
Which soil is used in cosmetics?
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Multani soil
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Terracotta soil
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Shadu soil
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Kaolin
Explanation
Multani soil is used in cosmetics. The terracotta soil is used to make decorative articles and pots used for growing plants.
Shadu soil is used for making statues and idols.
Kaolin (china clay) is used to make crockery, bathroom tiles, tanks, laboratory apparatus, masks, jars etc.
Soil profile refers to an arrangement within a soil of:
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The size of soil particles
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Its horizontal layout
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Its vertical layout
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Its water absorbing capacity
Explanation
Soil profile is defined as the vertical section of the soil from the ground surface downwards to where the soil meets the underlying rock.
Answer is option C.
Which of the following is incorrect statement?
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The structure of soil depends upon the different shapes of the particles in it.
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Soil occurs in the form of columnar, laminar, granular as well as block-shaped structures.
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The fertility of soil is independent of the soil structure.
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The uppermost layer is called topsoil and this layer is rich in humus.
Explanation
Option (C) represents an incorrect statement.
The fertility of soil depends upon the soil structure. Due to good soil structure, roots get a sufficient oxygen supply and water drainage is good. Therefore, the roots of plants grow well.
Why is the uppermost layer of soil dark?
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Due to the presence of humus
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Due to the presence of minerals
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Both A and B
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None of the above
Explanation
The uppermost layer that is topsoil is dark because it is rich in humus and minerals.
The type of soil suitable for growing paddy is:
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sandy soil
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loamy soil
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clayey soil
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bricks
Explanation
The best soil for growing paddy is the Clayey soil as they can hold the water due to their very fine particle size.
The type of soil suitable for growing masoor dal is:
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Sandy soil
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Loamy soil
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Clay soil
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Bricks
Explanation
Loamy soil contains enough humus which makes it one of the most ideal soil to do agriculture on. It is more fertile and Loamy soil is the most suitable for growing masoor dal as because it drains water easily.
In which of the following soil types, the proportion of fine particles are relatively higher than big particles?
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Clay soil
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Sandy soil
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Black soil
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Loamy soil
Explanation
If soil contains a greater proportion of big particles it is called sandy soil.
If the proportion of fine particles is relatively higher, then it is called clayey soil.
Clay soil particle size is very minute; extremely fine particles (0.002nm−0.05nm diameter).
If the amount of large and fine particles is about the same, then the soil is called loamy.
Hence, option A is correct.
Which of the following characteristic of clay soil make it useful to grow plants?
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Retain water and moisture
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Do not retain water and moisture
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Holds lot of sand
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None of the above
Explanation
Clay soil is mainly composed of the smallest particles of soil, which are densely packed with very few particles and effectively retain water. that's why it
helps the plants to grow well.
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