Soil structure is defined as what?

• A. The color of soil.
• B. The mineral composition of soil.
• C. The arrangement of soil particles into aggregates; improves porosity, infiltration, drainage, and root penetration.
• D. The organic matter content.

Answer: (D)

Soil structure is about how soil particles bind together into aggregates, creating pore spaces. That arrangement determines how air and water move through the soil and how easily roots can penetrate. A well-structured soil with stable aggregates improves porosity, infiltration, drainage, and root growth, which is why this concept is tested here. Color describes appearance, mineral composition is about what minerals are present, and organic matter content, while influential, is not the arrangement of particles itself.