Question

Organic matter is usually added to soil. Why?

• A. increase the alkalinity of the soil.
• B. decrease the alkalinity of the soil.
• C. increase the acidity of the soil.
• D. decrease the acidity of the soil.

Answer 1

The correct option is B

decrease the alkalinity of the soil.

Highly acidic or alkaline soil is not good for plant growth. If the soil is too acidic then lime is added to soil to increase its pH and to reduce it acidity. If the soil is too basic then the organic matter is added to soil to decrease its pH and reduces its alkalinity.