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CBSE Questions for Class 7 Chemistry Soil Quiz 3 - MCQExams.com
CBSE
Class 7 Chemistry
Soil
Quiz 3
Eastern states are mostly covered with these soils.
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0%
Red and yellow soils
0%
Alluvial soils
0%
Forest and mountainous soils
0%
Laterite soils
Explanation
Red and yellow soils are generally found in the Eastern Ghats, Odisha and Chattisgarh. The clay form of red soil is nutrient rich and viable for forestation. However coarse red or yellow soil has been completely leached of all its nutrients and is not fertile.
The correct answer is A.
If the percolation rate of water through a soil sample is 50 mL/min, then how much time will 500 mL of water take to percolate completely into the soil?
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0%
5 minutes
0%
10 minutes
0%
15 minutes
0%
20 minutes
Explanation
The time taken by
50
mL of water to percolate
=
1
min
=
60
seconds
Time taken by
500
mL of water to percolate
=
10
min
=
600
seconds.
Option B is correct.
Percolation rate of water is least in :
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0%
Sandy soil
0%
Clay soil
0%
Loamy soil
0%
Bricks
Explanation
Percolation refers to the process of a liquid slowly passing through a filter. So, filtration of water is least in clay soil due to its small particle size.
Read the following statements.
(a) Both _______ and_______ soils are suitable for growing wheat and gram.
(b) Paddy requires soil rich in ______ and _____ with a good capacity to retain water.
(c) For pulses, _______ soil is best suitable.
Select the option which correctly fills the blanks in any two of the statements.
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0%
(a)- Clayey, Loamy, (c)- Loamy
0%
(b)- Sand, Gravel (c)- Clayey
0%
(a)- Clayey, Sandy, (b)- Loam, Organic matter
0%
(b)- Clay, Loam, (c)- Sandy
Explanation
Clayey and loamy soils are both
suitable for growing cereals like wheat,
and gram. Such soils are good for
retaining water.
For paddy, soils rich
in clay and organic matter and
having a good capacity to retain water
are ideal.
For lentils (masoor) and other
pulses, loamy soils
are essential.
If the percolation rate of water of a particular soil sample is
30
m
L
/
m
i
n
, then how much time will
300
m
L
of water take to percolate completely into the soil?
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0%
800
s
e
c
0%
600
s
e
c
0%
200
s
e
c
0%
400
s
e
c
Explanation
The time taken by
30
mL of water to percolate
=
1
min
=
60
seconds
Time taken by
300
mL of water to percolate
=
10
m
i
n
=600 seconds.
The soil which is a mixture of sand, clay and silt is known as __________.
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0%
Loamy soil
0%
Sandy soil
0%
Clayey soil
0%
Desert soil
Explanation
The best topsoil for growing plants
is loam. Loamy soil is a mixture of sand,
clay and another type of soil particle
known as silt. Silt occurs as a deposit
in riverbeds.
A loamy soil usually contains:
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0%
mixture of sand and clay
0%
only clay
0%
only sand
0%
mixture of sand, clay and silt
Explanation
Loamy soil is the best topsoil for growing plants. It is a mixture of sand, clay, and silt. Hence o
ption D is correct.
Which of the following is(are) the basic component(s) of soil?
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0%
minerals
0%
organic matter
0%
water
0%
air
Explanation
The basic components of soil are minerals, organic matter, water and air. The typical soil consists of approximately
45
%
minerals,
5
%
organic matter,
20
−
30
%
water, and
20
−
30
%
air.
________ retains maximum amount of water.
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0%
Red soil
0%
Clayey soil
0%
Sandy soil
0%
Desert soil
Explanation
The soil's ability to retain water is strongly related to particle size; water molecules hold more tightly to the fine particles of clayey soil than to coarser particles of sandy soil.
Read the following statements with reference to soil.
i) Weathering is a very fast process of soil formation.
ii) Percolation of water is faster in sandy soils.
iii) Loamy soil contains only sand and clay.
iv) Top soil contains the maximum amount of humus.
Choose the correct statements from the above.
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0%
(ii) and (iv)
0%
(i) and (iii)
0%
(ii) and (iii)
0%
(i) and (ii)
Explanation
Statements (ii) and (iv) are correct. Options (i) and (iii) are wrong. (i) Weathering is a slow process of soil formation and (iii) loamy soil consists of sand, clay and silt along with humus.
If the percolation rate of water of a particular soil sample is
20
ml/min, then how much time will
200
ml of water take to percolate completely into the soil?
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0%
800
s
0%
600
s
0%
200
s
0%
400
s
Explanation
The time taken by
20
mL of water to percolate
=
1
min
=
60
seconds
Time taken by
200
mL of water to percolate
=
600
seconds.
Option B is correct.
Topsoil contains the following:
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0%
Humus and living organisms only
0%
Humus and soil particles only
0%
Humus, living organisms and plants
0%
Humus, living organisms and soil particles
Explanation
The upper or A-horizon is the
topsoil
that
contains
most of the litter living organisms and humus. The roots of small plants are embedded in
topsoil
.
The soil of Kerala is rich in which of the following soils?
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0%
clayey soil
0%
Laterite Soil
0%
Sandy Soil
0%
Loamy Soil
Explanation
The soil of Kerala is rich in Laterite soil (rich in iron and aluminum).
What happens when rain falls on soil without vegetation cover?
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0%
Rainwater percolates through soil efficiently.
0%
Rainwater washes way the top soil.
0%
Rainwater does not cause any change in soil.
0%
None of these
Explanation
Without vegetation the soil particles are held very close to each other and have no room for water to flow through them. Therefore, rainwater can not percolate through such soil type easily.
So, option A is not correct.
The plant roots are known to hold the soil in position, which makes it harder for soil to wash away accidentally. But in the absence of vegetation, this protection no longer exists and therefore, rainwater washes away the top soil.
This means option B is correct and C is incorrect.
Which type of soil is more likely to be removed very quickly?
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0%
The soil having not vegetative cover
0%
The soil that is base of vegetation
0%
The soil covered with grass
0%
All of these
Explanation
Roots of plants and trees hold soil firm and without them, the soil is exposed to any kind of calamity whether natural or man-made.
The upper layer of soil has excess of:
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0%
rocks
0%
gravel
0%
humus
0%
all of these
Explanation
The uppermost horizon is generally dark in colour as it is rich in humus and minerals.
Removal of the soil by the action of wind and water is known as :
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0%
Erosion
0%
weathering
0%
percolation
0%
Convection
Explanation
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, the soil becomes loose.
So it can be moved by wind and flowing
water.
Percolation rate of water is ______ in different types of soil.
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0%
same
0%
different
0%
undefined
0%
None of these
Explanation
Percolation rate of water is different in different types of soil. It is highest in sandy soil and least in clayey soil.
Erosion of soil is more severe in areas of:
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0%
desert and barren land
0%
high vegetation
0%
dense forests
0%
Both A and B
Explanation
Deserts and barren land have fewer plantations. As a result, the soil in those regions becomes loose and is easily eroded by wind. Thus soil erosion is more severe in deserts and bare land.
Crops such as _____are grown in fine clayey soils, because they are rich in humus and are very fertile.
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0%
Lentils
0%
Cotton
0%
Wheat
0%
All of these
Explanation
Crops such as wheat are grown in
fine clayey soils, because they are
rich in humus and are very fertile.
Lentils are grown in loamy soils.
Cotton is grown in sandy-loam or loamy soil.
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