Which statement best describes soilless media?

• A. They require soil to provide nutrients
• B. They are irrigated with saline water
• C. They are grown in soil-based media
• D. They rely on inert components like peat, perlite, or vermiculite for better aeration and drainage

Answer: (D)

Soilless media grow plants without mineral soil, using a mix of materials that create a porous, well-drained environment for roots while allowing precise control of moisture and nutrients. The best description is that they rely on inert components like perlite or vermiculite to form air spaces and promote drainage, often combined with other components such as peat to balance moisture retention. This setup keeps roots from sitting in water, provides good aeration, and allows nutrients to be delivered through irrigation. The other statements don’t fit because soil is not used to supply nutrients in soilless systems, saline irrigation isn’t a defining feature, and growing in soil-based media contradicts the idea of soilless cultivation.