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 is the function of stomata in tree leaves?

Release oxygen
Regulate temperature
Control soil nutrients
Allow water transportation

The correct answer is: Allow water transportation

Stomata are tiny openings on the surface of tree leaves that are responsiblefor the exchange of gases like carbon dioxide and oxygen. They also serve as entry points for water to enter and exit the leaf during transpiration. Option A, releasing oxygen, is incorrect because although stomata do release oxygen, this is not their primary function. Option B, regulating temperature, is incorrect because while stomata can help regulate temperature by opening and closing, this is not their main function. Option C, controlling soil nutrients, is incorrect because stomata are not involved in this process. Their main function is to allow water transportation through the leaf. Therefore, option D is the correct answer.