Soil and Its Formation

Q.

Why is earth called the unique planet?

Q.

What do you mean by hygroscopic water and combined water in the soil ? Are these available to plants?

Q.

What is paedogenesis?

Q.

Lichens growing on rocks are called

1. Corticolous

2. Saxicolous

3. Terricolous

4. Lignicolous

Q. The layer of the soil in which fungi and bacteria grow mostly is _______.

1. topsoil
2. subsoil
3. bedrock
4. sand

Q.

Name the two processes which contribute to. soil formation.

Q. The term pedology is referred to___________.

1. Formation of soil
2. Study of soil
3. Development of soil
4. Classification of soil

Q.

What do you mean by biological weathering ? Give two examples.

Q.

Name three physical agents which cause weathering of rocks.

Q.

What is weathering ? Elucidate in the various types of weathering.

Q. Living organisms such as lichens and mosses aid the weathering process.

1. True
2. False

Q. Humus is a major factor in deciding the soil structure.

1. True
2. False

Q.

How are living organisms are dependent on the soil?

Q.

How do organisms contribute in the formation of soil ?

Q.

How does the soil get polluted?

Q. Which of the following statements are true regarding soil formation?

1. Strong water flow causes wearing of rocks which leads to soil formation.
2. Outermost layer of Earth contains variety of nutrients.
3. Humus reduces the fertility of the soil.
4. Sun and water are two factors that helps in soil formation.

Q.

Which is the outermost layer of the Earth?

1. Crust

2. Mantle

3. Outer core

4. Inner core

Q.

Following are a few organisms.

(a) Lichen (b) Mosses (c) Mango tree (d) cactus

Which among the above can grow on stones; and also help in the formation of soil? Write the mode of their action for making soil.

Q.

What is soil ? How does it form ?

Q. The factors like water, wind and living organisms influence soil formation.

1. True
2. False

Q. Which of the following helps in weathering of rock and soil formation?

1. Algae
2. Lichens
3. Frogs
4. Worms

Q.

Which of the following is an example of man-made change?

1. Formation of clouds

2. Weathering of rocks

3. Cooking of food

4. Beating of the heart

Q.

The growth of Lichens on barren rocks is followed by the growth of :

1. Moss

2. Ferns

3. Gymnosperms

4. Algae

Q. Which of the following factor(s) is/are responsible for the process of soil formation?

1. Temperature
2. Water
3. Gravity
4. Wind

Q. Water can cause weathering of rocks through

1. Chemical weathering
2. Physical weathering
3. Biological weathering
4. Humification

Q.

Which of the following factors is not responsible for soil formation?

1. Wind

2. Water

3. Sun

4. Greenhouse effect

Q. Which of the following is not a factor that affects the process of soil formation?

1. Parent rocks
2. Time
3. Soil texture
4. Climate

Q. Wind is a biological factor that influence soil formation.

1. False
2. True

Q.

Define paedogenesis.

Q.

Define soil.