The question focuses on what contaminates soil primarily.
Step 2: Evaluate options
Chemical fertilizers and pesticides add toxic substances to soil. Noise pollution affects living beings but not soil. Smoke causes air pollution. Oil spills pollute water, not soil directly.
Final Answer:
Use of chemical fertilizers and pesticides → Option A
Quick Check:
Primary cause of soil pollution = Chemical fertilizers and pesticides ✅
Quick Trick:Link fertilizers and pesticides directly to soil contamination.
Common Mistakes:
Mixing noise or air pollution causes with soil pollution.
Master "Physics (Basics)" in General Science
Start learning the concept with an interactive lesson.