Certified Arborist Test 2025 – 400 Free Practice Questions to Pass the Exam

Antitranspirants are substances that reduce water loss through the process of transpiration, which is the evaporation of water from plant leaves. By creating a barrier on the leaf surface or influencing the stomata (the tiny openings on leaves), antitranspirants help to decrease the amount of water vapor that escapes into the atmosphere.

This is particularly beneficial in conditions where plants are under stress due to drought or high temperatures, as it helps them retain moisture and maintain hydration. By minimizing water loss, antitranspirants enable plants to survive and thrive in environments where water is limited.

The other options involve processes or enhancements that are not the primary functions of antitranspirants. For instance, increasing nutrient absorption and enhancing soil quality refer to different agricultural and horticultural practices, while promoting leaf growth pertains to plant development rather than conservation of water.