Certified Landscape Irrigation Auditor

Which of the following characteristics is associated with drought-tolerant plants?

1. Shallow roots and broad leaves

2. Deep roots, waxy leaves, leaf hairs, and leaves that curl under stress

3. Rapid growth and large leaf surfaces

4. High water requirements and low heat tolerance

The correct answer is: Deep roots, waxy leaves, leaf hairs, and leaves that curl under stress

Drought-tolerant plants possess a variety of adaptations that enable them to survive in environments where water is scarce. Deep roots allow these plants to access moisture from deeper soil layers, which is essential during prolonged dry periods. Waxy leaves help reduce water loss through evaporation, serving as a protective barrier that retains moisture. Leaf hairs can create a microenvironment that traps humidity around the leaf surface, further minimizing water loss. Additionally, leaves that curl under stress help reduce the surface area exposed to direct sunlight and wind, which can otherwise exacerbate water loss. These characteristics are crucial for plants that thrive in dry conditions, enhancing their ability to conserve water and withstand drought. In contrast, options discussing shallow roots and large leaf surfaces typically relate to plants that require more water, making them less suited to drought conditions.