Horizon

Q.

Explain the different layers of soil.

Q.

Each layer of the soil is different in its texture, colour, depth and chemical composition. These layers collectively are known as ___ .

Q. What are some steps we can use to conserve soil? Explain. [3 MARKS]

Q. Which among the following is the correct arrangement of different layers of soil from top to bottom?

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

Q. Humus present in the soil determines the fertility of the soil.

1. True
2. False

Q. Which one of the following is not a method to prevent soil erosion?

1. Improve drainage
2. Afforestation
3. Deforestation
4. Contour farming and terracing

Q.

What is humus and what is its importance for soil?How can you differentiate humus from a decomposer? [3 MARKS]

Q.

What determines the thickness of soil profile? A) Climate B) Time C) Relief D) Wind

Q. explain the ways by which we can prevent soil erosion and pollution

Q.

Which of the following is the correct sequence of soil layers (starting from the surface) if a vertical profile of soil is taken?

1. A horizon→C Horizon →B Horizon→Bedrock

2. C horizon→A Horizon →B Horizon→Bedrock

3. Bedrock→C Horizon →B Horizon→A horizon

4. A horizon→B Horizon →C Horizon→Bedrock

Q.

Availability of water and minerals in the soil for maximum absorption by roots is in the –

(a) B-horizon
(b) C-horizon
(c) A-horizon
(d) surface of soil

Q. The maximum amount of humus is found in _______.

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

Q.

. Why step farming is the common agricultural practice in mountainous regions?

How can overgrazing leads to soil erosion?

Q. (a) What is soil composed of? [1 mark]
(b) What do you understand by soil profile? [1 mark]

Q.

Match the following and choose the correct option:

$\begin{array}{cc}i.\text{A - horizon}& a.\text{Small lumps of rocks}\\ ii.\text{B - horizon}& b.\text{Partially decomposed organic matter}\\ iii.\text{C - horizon}& c.\text{Rich in humus, living creatures, and inorganic minerals}\\ iv.\text{O-horizon}& d.\text{Less humus and more minerals, compact}\end{array}$

1. i - a; ii - b; iii - c; iv - d

2. i - b; ii - c; iii - a; iv - d

3. i - c; ii - d; iii - a; iv - b

4. i - d; ii - c; iii - b; iv - a

Q. Each layer of the soil is different in its texture, colour, depth and chemical composition. These layers collectively are known as ___ .

1. soil layers
2. horizon
3. bedrock
4. surfaces

Q. After the soil is born how does it die?

Q. Top layer of soil is

1. O-Horizon
2. A-Horizon
3. B-Horizon
4. E-Horizon

Q. In addition to the rock particles, the soil contains________.

1. air
2. water
3. all of the above
4. organic matter

Q. Which soil horizon contains humus?

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

Q.

As we keep digging through the different layers of soil, we reach a point where the surface becomes hard to dig. Which layer of soil is this?

1. Horizon A

2. Bedrock

3. Horizon C

4. Horizon B

Q. The study of the vertical section of the layers of the soil is known as

1. Soil study
2. Soil profile
3. Soil layering
4. Soil weathering

Q.

Identify the layer of soil which is not rich in humus but rich in minerals.
___ (Fill in the blank).

Q. From the following diagram, identify the different layers of soil :

1. i) - O horizon; ii) - A horizon; iii) - C horizon; iv) - E horizon
2. i) - A horizon; ii) - B horizon; iii) - C horizon; iv) - R horizon
3. i) - O horizon; ii) - A horizon; iii) - C horizon; iv) - R horizon
4. i) - B horizon; ii) - A horizon; iii) - R horizon; iv) - C horizon

Q. A- Horizon is the top layer of the soil which is porous and soft.

1. False
2. True

Q. Why is the uppermost layer of soil dark?

1. Due to the presence of humus
2. Due to the presence of minerals
3. Both A and B
4. None of the above

Q. The darkest layer of soil is:

1. Top soil
2. Bedrock
3. B - horizon
4. C - horizon

Q.

Which of the following is/are correct about soil?

1. Soil supports plant life

2. Soil hold water

3. Soil is used in the making of pottery

4. None of these

Q. Which of the following statements are true?​
1. A-horizon is rich in humus.​
2. Few plant roots can reach to B-horizon.​
3. B-horizon is rich in both humus and minerals.
4. ​ C-horizon is made up of small lumps of rocks with cracks and crevices.​
5. Wind and water are the only agents responsible for weathering of rocks.​

1. 1 and 2 only
2. 2, 3, and 4 only ​
3. 1 and 2 only ​
4. 1, 2, and 4 only ​

Q.

Match the following and choose the correct option:

$\begin{array}{cc}i.\text{A - horizon}& a.\text{Small lumps of rocks}\\ ii.\text{B - horizon}& b.\text{Partially decomposed organic matter}\\ iii.\text{C - horizon}& c.\text{Rich in humus, living creatures, and inorganic minerals}\\ iv.\text{O-horizon}& d.\text{Less humus and more minerals, compact}\end{array}$

1. i - a; ii - b; iii - c; iv - d

2. i - b; ii - c; iii - a; iv - d

3. i - c; ii - d; iii - a; iv - b

4. i - d; ii - c; iii - b; iv - a