Page 100 - Science class 4

2. ______________ soil is fertile and suitable for plants to grow.

3. ______________ soil is light and contains a little quantity of organic matter.

4. Cutting of trees on a large scale results in ______________ .

5. The protection of topsoil from being blown away or washed away is called

______________.

Clear Approach
Clear Approach

Write ‘T’ for true and ‘F’ for false statements :

1. The organic matter consists of decayed plants and animals.

2. Humus makes the soil fertile.

3. Subsoil is suitable for growing plants.
4. Clay is a light soil.

5. Plants grow well in soft soils.
6. We can prevent soil erosion completely.

Substituting Yourself
Substituting Yourself

Give one word for each one of the following :

1. This soil holds little water _________________

2. Bacteria fix this gas from atmosphere _________________

3. They help us control flood _________________

Brush Up Your Learning
Brush Up Your Learning

A. Answer the following questions :

1. What is soil?

2. How is soil formed?

3. What is sandy soil?

4. What does loamy soil consist of? What is it used for?

5. What is conservation of soil?

6. Why is conservation of soil necessary?

B. Answer the following questions briefly :

1. Name four types of soil.