Soil Profile

Q. The components of loamy soil are _____, _____ and ______.

Q.

The soil has particles of different sizes. Arrange the words given below in increasing order of their particle size. (Rock, Clay, Sand, Gravel, Silt)

Q. Identify the layer in the soil profile that is rich in humus and also act as a shelter to various living organisms.

1. A- Horizon
2. B- Horizon
3. C- Horizon
4. Bedrock

Q.

The mixture of rock particles of different sizes, various other materials and humus is called soil.

1. True
2. False

Q. Which is the collective name for the layers of soil?

1. Erosion
2. Sedimentation
3. Soil profile
4. Weathering

Q.

When a small amount of garden soil is put into a glass jar containing water, stirred and allowed to the stand for two hours, The layer from top to bottom would be-

1. Debris, water, sand and clay

2. Humus, water clay and sand

3. Debris, clay, gravel, and sand

4. Humus, clay gravel and sand

Q.

How can you say soil is a mixture?

Q.

The layer of soil just below the subsoil is

1. A-horizon

2. B-horizon

3. C-horizon

4. D-horizon

Q.

What is the difference in the rocks of the C horizon and the rocks in the bedrock.

Q.

Which among the following layers of soil is the hardest?

1. Top soil

2. Humus

3. Subsoil

4. Bedrock

Q.

Topsoil contains the following

1. Humus and living organisms only

2. Humus and soil particles only

3. Humus, living organisms and plants

4. Humus, living organisms and soil particles

Q.

Why do different regions have different soil profiles?

1. The cultures are different in different regions.

2. Different crops are grown in different regions.

3. Cannot be determined.

4. The climatic conditions are different in different regions.

Q. Fungi and bacteria grow mostly on topsoil.

1. True
2. False

Q.

Which of the following situations - 'A' or 'B' - is advantageous for absorption of water and minerals? Why?​

​Situation 'A': Growth and branching of roots in the C-horizon. ​

​Situation 'B': Growth and branching of roots in A and B horizons.

Q.

Question 20

Several terms related to soil are hidden in the squares given as Figure 9.2. Spot them and make a list.Two examples are given for you.

Q. Sketch the cross section of soil and label the various layers.

Q. Bholu thinks that he can dig a hole to centre of the Earth with just a shovel. He says he can do this by digging vertically down.

From which layer of the soil do you think Bholu will be unable to dig with his shovel?

1. Top soil
2. Sub soil
3. Bedrock
4. Mantle

Q.

Soil is made up of other things in addition to rock particles. Other than rock particles, soil contains________.

Q. Choose the option showing the correct arrangement of different layers of soil from top to bottom.

1. $Topsoil\to Subsoil\to Bedrock$
2. $Bedrock\to Topsoil\to Subsoil$
3. $Subsoil\to Topsoil\to Bedrock$
4. $Subsoil\to Bedrock\to Topsoil$

Q.

Question 9

Which of the following situations – ‘A’ or ‘B’ – is advantageous for absorption of water and minerals? Why?
Situation ‘A’ : Growth and branching of roots in the C-horizon.
Situation ‘B’ : Growth and branching of roots in A and B horizons.

Q. ________ determines thickness of soil profile.

1. Climate
2. Time
3. Relief
4. Wind

Q. The soil profile is an arrangement in a soil of its:

1. horizontal layout
2. vertical layout
3. diagonal layout
4. the depth of soil

Q. Bholu thinks that he can dig a hole to centre of the Earth with just a shovel. He says he can do this by digging vertically down.

From which layer of the soil do you think Bholu will be unable to dig with his shovel?

1. Top soil
2. Sub soil
3. Bedrock
4. Mantle

Q. Bholu thinks that he can dig a hole to centre of the Earth with just a shovel. He says he can do this by digging vertically down.

From which layer of the soil do you think Bholu will be unable to dig with his shovel?

1. Top soil
2. Bedrock
3. Sub soil
4. Mantle

Q.

What do you understand by 'Soil Profile'?

1. It is a vertical section of the soil showing different layers.

2. It is a horizontal section of the soil showing different layers.

3. The topmost layer of soil is called soil profile.

4. The bottom most layer of soil is called soil profile.

Q.

Take a handful of soil from a nearby garden and mix it in a clear glass partially filled with water. Stir the mixture and leave it undisturbed. What do the different layers obtained after the mixture has settled down prove?

1. Soil is made up of different types of components

2. Tthe garden is necessarily polluted

3. Soil is made up of a number of different types of components and soil is a muddy solution

4. Soil makes a muddy solution

Q.

What is the vertical section of soil called?

1. Soil setup

2. Soil profile

3. Soil section

4. Humus

Q.

Soil profile is a vertical section of the different layers which make up soil.

1. True

2. False

Q.

Question 13

Locate the following zones given as boxed items in Figure 9.1 which shows a diagram of the soil profile.

$\begin{array}{c}Topsoil,Subsoil,C-horizon,Bedrock\end{array}$

Q. Which of the following is/are not the characteristics of red soils?
$1$. They are derived from weathering of old crystalline and metamorphic rocks.
$2$. They contain iron oxides.
$3$. They have high water retention capacity.
$4$. They have high nitrogen content.

1. II and III
2. Only III
3. Only IV
4. III and IV