Page 231 - New Medley 5 Semester 2

B. Fill in the blanks with the words given in the box.

soil erosion pesticides chemical fertilisers
terrace farming vegetation rocks

1. Breaking up of into tiny pieces forms soil.

2. Carrying away of the topsoil by wind, rain or owing water is called .
3. Soil erosion due to wind is greatest in areas where there is less .
4. On hill slopes, soil erosion is prevented by .

5. e excessive use of and in elds causes soil
pollution.

C. Answer these questions.

1. What do you understand by weathering of rocks?
2. How is soil formed?

3. What is soil erosion? Name the main factors causing soil erosion.

4. What is soil conservation? Why is it important?
5. Di erentiate between deforestation and a orestation.

6. What are the major sources of soil pollution?

Think and Answer • Critical Thinking

1. Solid, non-biodegradable wastes should not be dumped on land. Why?

2. Why should cattle not be made to graze at the same place regularly?

Let Us Do • Creativity/Digital Integration

1. If possible, visit the places where terrace farming is undertaken. Click pictures and
make a model of terrace farming using moulding clay.

2. Find out information about hydroponics, multiple cropping and crop rotation.

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