|Man causes soil erosion through|
|1. Use of improper ploughing methods.|
|2. Leaving roots of crop in the field after harvest.|
|3. Practicing trash farming.|
|4. Use of heavy machines.|
|Select the correct answer using the codes given below.|
A) 1, 2 and 3 only
B) 1 and 4 only
C) 1, 3 and 4 only
D) 1, 2, 3 and 4 only
Correct Answer: B
Solution :[b] Leaving roots of the crop in the field after harvest is a called stubble mulching and it prevents soil erosion. Similarly trash farming means spreading and planting the residue in the field and it prevents soil erosion. Use of heavy machine leads to soil compaction and reduction in infiltration of rainwater. The rainwater then flows heavily as runoff and washes away the soil.
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