(b) crop rotation 3. 4. More than 50% of India's 5. Water pollution is the contamination of water by sewage, C. Choose the correct option. 1. Which of the following help preserve soil fertility? (a) mulching (d) fallowing (c) plugging gullies 2. Which of the following is not a method of checking soil erosion? (b) terracing (a) afforestation (d) contour ploughing (c) salinisation Different layers of soil are called: (a) humus (b) soil formation (c) bedrock (d) horizons. 4. Which materials accumulate in the soil and in crops grown on the soil. (a) Pesticides (b) Non-biodegradable (c) Conservation (d) Pollution Answer the following question orally. 1. What percentage of the earth's surface is made up of land masses. 2. List four factors that affect soil formation. 3. What is soil? 4. What is Afforestation?
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you can choose NCRT book for solution that questions
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