Certified Arborist Practice Test

Phloem serves the essential function of conducting carbohydrates throughout the tree. It is the tissue responsible for the transport of photosynthates, primarily sugars produced during photosynthesis, from the leaves (where they are produced) to other parts of the tree, including the stems and roots. This process is critical for the tree’s growth and metabolism, as carbohydrates are necessary for energy production and the formation of new plant materials.

Phloem cells facilitate the movement of these nutrients through a system of sieve tubes and companion cells, ensuring that the tree has access to the energy it needs for various biological processes, including growth, development, and the storage of energy for later use. This function is vital for maintaining the overall health and vitality of the tree, especially during periods when photosynthesis is not occurring, such as in the winter months or during times of stress.