ISA Certified Arborist Practice Exam

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Prepare for the ISA Certified Arborist Exam with detailed flashcards and multiple-choice questions, each offering hints and explanations. Ace your certification test!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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

Sunlight intensity
Age of the tree
Number of leaves
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.