Ace the ISA Certified Arborist Test 2024 – Branch Out and Conquer Your Career!

Fertilizer can be introduced into the xylem of a tree through injections. Nomenclature refers to the system of naming or classifying things, so it is not directly related to the introduction of fertilizer in the xylem. Macronutrients are essential elements that plants need in large amounts, but they are usually supplied through the soil and taken in by the roots. Acclimation refers to the process of adapting to a new environment or conditions, so it is not directly related to the introduction of fertilizer into the xylem. Injections involve directly inserting or injecting a substance into a plant, which is why this is the correct answer for the given question.