ISA Certified Arborist Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

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!

Practice this question and more.

Which quality is essential for photosynthesis to occur in leaves?

High humidity
Low temperature
Regular watering
Access to sunlight

The correct answer is: Access to sunlight

Sunlight is essential for photosynthesis to occur in leaves because it provides the energy needed for the process to take place. Humidity and temperature can affect the rate of photosynthesis, but they are not essential for it to occur. Regular watering is important for plant health, but it is not directly related to photosynthesis. Without access to sunlight, leaves cannot carry out photosynthesis and produce food for the plant. Therefore, access to sunlight is the most essential quality for photosynthesis to occur in leaves.