What do macropores mainly allow?

• A. Plant available water
• B. Infiltration capacity only
• C. Water retention
• D. Drainage and air movement

Answer: (D)

Macropores are large soil pores that act as rapid pathways for water and air. Because of their size, water drains through them quickly under gravity, so they primarily enable drainage rather than long-term water storage. Their connected networks also allow easy movement of air through the soil, improving aeration and gas exchange for roots and microbes. While infiltration can be influenced by these channels, the key impact of macropores is fast drainage and improved soil aeration, not water retention.