Certified Arborist Practice Exam

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These types of chemicals are used to enhance or alter the growth and development of plants:

Thimble

Cabling helps support which defects?

Plant growth regulators (anti-gibberillins)

Plant growth regulators (anti-gibberillins) are chemicals used to alter the growth and development of plants. Thimble (A) and Cabling (B) are not types of chemicals, but rather objects used for different purposes. Lag-threaded and machine-threaded (D) refer to types of threading and are not related to the growth and development of plants. Therefore, the best answer is C.

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Lag-threaded, machine-threaded