What is meant by capillarity in soils?

• A. The ability of soil to filter pollutants
• B. The upward movement of moisture from a water source
• C. The maximum weight of soil that can hold plants
• D. The compactness of soil particles

Answer: (B)

Capillarity in soils refers specifically to the upward movement of moisture through the small pores between soil particles. This phenomenon occurs due to the cohesive and adhesive properties of water, which allow it to move against gravity in response to changes in water availability. In contexts such as agriculture or gardening, understanding capillarity is crucial because it influences how water is distributed within the soil profile, thereby affecting plant growth and the availability of nutrients.

The option indicating the upward movement of moisture effectively captures the essence of capillarity, emphasizing its role in transporting water from deeper layers of soil to the surface, where it can be utilized by plant roots.