Question

Organic matter which is useful to plants is usually found most abundantly in ____________.

• A. sand
• B. clay
• C. sub-soil
• D. top soil

Answer 1

The correct option is D top soil

Topsoil is the upper, outermost layer of soil, usually the top 5–10 inches (13–25 cm). It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Topsoil is composed of mineral particles, organic matter, water, and air.

The correct answer is D.