ISA Arborist Certification Glossary Questions with Complete Solutions(SCORED A+)

abiotic: - ANSWER-pertaining to the nonliving parts of an ecosystem, such as soil particles, bedrock, air, water. abscisic acid (ABA): - ANSWER-a plant hormone that stimulates stomatal closure and promotes seed and bud dormancy. abscission zone: - ANSWER-a wall of cells at the base of a petiole, that allows the leaf to separate from the stem. acceptable risk: - ANSWER-the amount of risk that an owner is willing to accept before tree failure. accessibility: - ANSWER-the establishment of a location used to enter a site. acidic soil: - ANSWER-having a pH les than 7.0, in contrast with alkaline which has a pH that is higher than 7.0. actinomycetes: - ANSWER-microorganisms that have some characteristics of fungi and bacteria. Soil actinomycetes are very tolerant of water stress and contribute through their actions to that "good earth" aroma after a rain. action: - ANSWER-the number of distinct motions for the carabineers and snaps gate to be opened. action threshold: - ANSWER-the point at which a pest requires the implementation of a management tactic or control.