MCQ Questions for Class 7 Chemistry Soil Quiz 1

Which soil would have lowest percolation rate?

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Clayey soil
0%
Sandy soil
0%
Loamy soil
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None of these

Explanation

Clay particles are so tiny and have many small pore spaces that make water move slower (the highest water holding capacity).

Option

$A$ is correct.

Percolation of water is faster in______ soil.

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sandy
0%
clayey
0%
loamy
0%
none of these

In addition to the rock particles, the soil contains________.

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air
0%
water
0%
organic matter
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all of the above

Which type of soil will allow water to reach a well faster and in a greater amount?

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Clayey soil
0%
Sandy soil
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Loamy soil
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None of these

Which soil horizon contains humus?

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A- Horizon
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B- Horizon
0%
C- Horizon
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Bedrock

Which of the following is/are the main agents of soil erosion?
A) Wind and water B) Rocks C) Sand

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A
0%
A & B
0%
B & C
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A, B, C

Which type of soil is best for growing cotton ?

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Red soil
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Black soil
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Grey soil
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Alluvial soil

Which one of the following statement is correct about soil?

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B-horizon of soil contains maximum amount of humus
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C-horizon of soil contains maximum amount of humus
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A-horizon of soil contains maximum amount humus
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None of these

Explanation

The uppermost horizon is generally dark in colour as it is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water.

It is called the topsoil or

$\text{A-horizon}$ of the soil.

Which of the following soils has very less content of humus?

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Sandy soil
0%
Loamy soil
0%
Clayey soil
0%
None of these

Explanation

$\textbf{Correct option:}$

$\textbf{(A)}$

$\textbf{Solution:}$

$\textbf{Option (A)}$

$\bullet$ Sandy soil has less humus and is therefore less fertile.

$\bullet$ It consists of big particles with wide air spaces between them.

$\bullet$ Its porosity prevents water from being retained.

$\textbf{Option (B)}$

$\bullet$ Sand and silt are found in equal proportions in loamy soil.

$\bullet$ It contains a lot of humus.

$\bullet$ It's permeable and may hold moisture as well.

$\bullet$ It is beneficial to agricultural cultivation and gardening.

$\textbf{Option (C)}$

$\bullet$ Clay soil particles are small and firmly packed, preventing water from draining fast.

$\bullet$ Clayey soil is also poorly aerated, retaining more water.

$\bullet$ Because of the microscopic particles, humus may easily mix or pack with clayey, which helps to keep the soil moist and fruitful.

$\textbf{Thus the Correct option is (A)}$

Soils consisting of various proportions of sand, silt, clay, and gravel predominant in planes of north India are _________.

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Alluvial soil
0%
Black soil
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Red soil
0%
Laterite soil

Soil is formed by _____ process.

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Erosion
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Weathering
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Both A and B
0%
None of the above

The darkest layer of soil is:

0%
Top soil
0%
Bedrock
0%
B - horizon
0%
C - horizon

Explanation

$\textbf{Correct option:}$

$\textbf{(A)}$

$\textbf{Solution:}$

$\textbf{Option (A)}$

$\bullet$ Decomposing bacteria and fungi destroy dead plants and animals in the soil.

$\bullet$ Humus is the substance that results from this degradation process.

$\bullet$ Humus is a nutrient-dense, black-colored substance.

$\bullet$ As a result, topsoil is the darkest.

$\bullet$ The more humus in the soil, the more productive it is.

$\textbf{Option (B) and (D)}$

$\bullet$ Parent rock, often known as bedrock, is found immediately beneath the subsoil.

$\bullet$ It is particularly hard since it contains no organic matter and is made mainly of stones and rocks.

$\bullet$ The transition zone between the earth's bedrock and horizons A and B is represented by this layer.

$\textbf{Option (C)}$

$\bullet$ A layer known as subsoil or horizon-B lies just beneath the topsoil.

$\bullet$ It is a lot tougher and more compact than topsoil.

$\bullet$ Because there is less humus in this layer, it is lighter in colour than the topsoil.

$\bullet$ This layer is less organic, but it is abundant in minerals that have been carried down from the topsoil.

$\textbf{Thus the Correct option is (A)}$

Which of the following soil possess highest percolation rate?

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Sandy soil
0%
Clay soil
0%
Loamy Soil
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None of these

The given pie charts show the composition of three types of soil samples

$X, Y,$ and

$Z$ . Which of the following is correct regarding these?

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$X$ is unable to hold water or nutrients.
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$Y$ is used for pot making.
0%
$Z$ provides good amount of oxygen to roots for breathing.
0%
$X$ is best suited for cultivation.

Explanation

$X$ is best suited for cultivation as it contains all the types of soil (sand, silt, and clay) in the right proportion. Silt is the most fertile soil and clay soil can hold enough water, whereas sandy soil is well aerated.

Clay is used for making pots and bricks because it is:

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opaque
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non-magnetic
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a good conductor of heat
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easily moulded into different shapes

Which of the following soils are good at retaining water?

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Sand and Clayey
0%
Loamy and Sandy
0%
Loamy and Clayey
0%
All of the above

Explanation

$\textbf{Correct option: }$ C

$\textbf{Solution: }$

$\textbf{Option (A) }$

$\bullet$ The clay soil consists of the smallest soil particles with larger surface area.

$\bullet$ Clay also has very less aeration, because water displaces air between the spaces of clay particles.

$\bullet$ A larger surface area allows better water holding capacity of soil .

$\bullet$ The particles of the sandy soil are larger and the space between them is quite smaller.

$\bullet$ The smaller surface area of the soil reduces the water handling capacity of the soil.

$\textbf{Option (B) }$

$\bullet$ The loam soil is composed of sand, silt, and clay soil.

$\bullet$ Therefore, the percentage holding capacity of water in this soil is also less as compared to the silt or clay soil.

$\bullet$ The particles of the sandy soil are larger and the space between them is quite smaller.

$\bullet$ The smaller surface area of the soil reduces the water handling capacity of the soil.

$\textbf{Option (C) }$

$\bullet$ The loam soil is composed of sand, silt, and clay soil.

$\bullet$ Therefore, the percentage holding capacity of water in this soil is also less as compared to the silt or clay soil.

$\bullet$ Clay also has very less aeration, because water displaces air between the spaces of clay particles.

$\bullet$ This results in the better water holding capacity of the clayey soil.

Hence, the correct option is (C)

........... is used to make pots, toys and statues.

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Silt
0%
Loamy soil
0%
Sandy soil
0%
None of the above

Which soil has the intermediate rate of percolation?

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Sandy
0%
Loamy
0%
Clayey
0%
None of the above

Which of the following top soil is most suitable for the growth of plants?

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Clay soil
0%
Black soil
0%
Loam soil
0%
Sandy soil

Which of the following crop yields more if it is grown in clay and organic matter and having a good capacity to retain water ?

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Paddy
0%
Cotton
0%
Wheat
0%
None of these

Explanation

Paddy crop yields more if it is grown in clay and organic matter and having a good capacity to retain water. Wheat crops yield more when it is grown in fine clayey soil because it is rich in humus and is very fertile. Cotton is grown in sandy and loamy soil, which drains water easily and holds plenty of air. Thus, the correct answer is

$A$ .

CBSE Questions for Class 7 Chemistry Soil Quiz 1 - MCQExams.com

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Practice Class 7 Chemistry Quiz Questions and Answers

CBSE Questions for Class 7 Chemistry Soil Quiz 1 - MCQExams.com

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Practice Class 7 Chemistry Quiz Questions and Answers

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