Soil

Q. How much percentage of the earth is covered by land?

1. 50%
2. 29%
3. 71%
4. 90%

Q.

How is soil formed? [1 MARK]

Q. Write a note on "Preparation of the soil".

Q.

Define granular and block disintegration

Q. Which of the following is the bottom most layer of a soil profile?

1. Weathered rock
2. Subsoil
3. Topsoil
4. Bedrock

Q.

What is accretion?

Q.

Physical factors like water and wind, chemical processes like hydration, biological factors like ___ influence soil formation.

Q.

What is called Lithosphere, define it?

Q.

Air, water and land are the factors important for sustaining the living world on the earth.

1. True

2. False

Q. The layer of the soil where dead and decaying matter is present is known as_______.

1. Topsoil
2. Humus
3. Subsoil
4. Bedrock

Q.

Which of the following are provided by soil to plants?

1. Water

2. Air

3. Support

4. Nutrients

Q.

Write a note on the formation of soil.

Q.

What is the best soil pH for most plants?

Q.

Is water made up of cells?

Q.

Which layer of soil is rich in organic matter?

1. Bedrock

2. Immature soil

3. Humus

4. None of the above

Q. Which of the following does not pollute the soil?

1. Throwing garbage on soil
2. Using chemical fertilizer
3. Relaeasing industrial waste in soil
4. Reducing usage of plastic

Q. Give four importance of soil loosening?

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. The most determining factor for soil formation is

1. Parent rock
2. Running water
3. Humus
4. Industrialisation

Q.

In addition to the rock particles, the soil contains

1. Air and water

2. Water and plants

3. Minerals, organic matter, air, and water

4. Water, air and plants

Q. Where do we get the house building materials?

1. Air
2. Water
3. Sky
4. Land

Q. Which of the following is/are the benefits of the organic farming?
(i) It reduces the risks of humans, animals and environmental exposure to toxic materials.
(ii) It reduces the soil erosion.
(iii) It enriches the soil with microbial growth.

1. (i) only
2. (ii) only
3. (ii) and (iii) only
4. (i), (ii) and (iii)

Q. Where does the sediments come from?

1. Sediments accumulate as dust fell on Earth from the outer space
2. Weathering of rocks produce sediments
3. Sand is transported and deposited as sediment
4. They have always been present on Earth

Q.

What do you mean by topsoil? what are the constituents of top soil?

Q.

Justify: “Soil supports the plant life”.

Q.

Name two methods employed in organic farming to increase soil fertility.

Q. Which of the following living organism live over the land surface?

1. 
2. 
3. 
4. 

Q. Which of the following statements are correct regarding the importance of soil?

1. Soil is essential for agriculture.
2. Soil supports the growth of plants.
3. Soil contains many micro-organisms.
4. Soil absorbs water and nutrients from the plants.

Q. How do organisms help in soil formation?

Q.

What is soil profile?