Question

In an average soil, the percentage of organic matter is about

• A. 20
• B. 30
• C. 45
• D. 5

Answer 1

The correct option is D 5

1) Soil is made up of four main constituents namely air, mineral particles, water, and organic matter.

2) Out of these four constituents, inorganic matter like mineral particles and organic matters like organisms, roots of plants, humus are responsible for the solid content in the soil.

3) In the normal agricultural soil, 45% are minerals, 5% are organic matters, 25% is air and 25% is water.

4) Hence, in average soil, the percentage of organic matter is about 5%.

So, the correct answer is '5'