ISA Certified Arborist Practice Exam

The primary function of roots in trees is to anchor the tree and absorb water and nutrients from the soil. Roots play a crucial role in stabilizing the tree, ensuring that it remains upright and secure, which is essential for accessing sunlight and resisting environmental stressors such as strong winds.

In addition to anchoring the tree, roots are equipped with specialized structures that facilitate the uptake of water and essential nutrients, such as nitrogen, phosphorus, and potassium, from the surrounding soil. This nutrient absorption is vital for the overall health and growth of the tree, as these components are necessary for various physiological processes.

While supporting the tree in high winds and storing carbohydrates are important functions as well, they are not considered the primary role of roots. Photosynthesis is carried out primarily by the leaves, which are designed to capture sunlight and convert it into energy. Therefore, the correct choice reflects the fundamental duties of roots in sustaining the tree's growth and stability.