Which trait is an example of a plant adaptation to prevent water loss?

• A. Stomata
• B. Waxy epidermis
• C. Root hairs
• D. Thorns

Answer: (B)

Protecting the plant’s water reserves relies on barriers that limit evaporation from the surface. A waxy epidermis forms a waterproof cuticle over the leaf and stem surfaces, reducing water loss by preventing water from evaporating through the outer layers. This adaptation is especially beneficial in dry environments where conserving water is critical.

Stomata are openings that allow gas exchange; when they are open, water vapor escapes, so they’re a route for water loss rather than a barrier to it. Root hairs help the plant take up water from the soil, not prevent its loss. Thorns mainly serve as a defensive feature and don’t directly reduce water loss.