ISA Certified Arborist Practice Exam

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Study for the ISA Certified Arborist Exam. Prepare with flashcards, multiple choice questions, and comprehensive hints and explanations. Get ready to ace your exam!

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

  1. Sunlight intensity

  2. Age of the tree

  3. Number of leaves

  4. Acidity or alkalinity

The correct answer is: 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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