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

Question: 1 / 400

What does the term 'pH' measure in the context of trees?

Sunlight intensity

Age of the tree

Number of leaves

Acidity or alkalinity

The term 'pH' measures the acidity or alkalinity of the soil in which trees are growing. The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 indicate acidity, while values above 7 indicate alkalinity. Understanding the pH of the soil is crucial for arborists as it directly affects the availability of essential nutrients to the tree roots. Maintaining the proper pH level is important to ensure the health and vitality of trees.

Options A, B, and C do not relate to what the term 'pH' measures in the context of trees.

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