ISA CERTIFICATION EXAM | ACTUAL TEST QUESTIONS & VERIFIED ANSWERS | LATEST UPDATE | PASS ON FIRST TRY Acclimation - --ANSWER --Physiological adaptation process of plants and other living organisms to a climate or environment different from their native environment or where originally grown. Actinomycetes - --ANSWER --A group of soil bacteria resembling fungi. Actinomycetes play a role in the decomposition of organic matter and the release of mineral elements. Action Threshold - --ANSWER --A pest population or plant damage level that requires action to prevent irreversible or unacceptable physiological and/or aesthetic harm. Acute - --ANSWER --A disorder or disease that occurs suddenly or over a short period of time. Contrast with chronic. Adaptability - --ANSWER --The genetic ability of plants and other living organisms to adjust or acclimate to different environments. Adventitious Bud - --ANSWER --A bud arising from a place other than a leaf axil or shoot tip, usually as a result of hormonal triggers.Aggregate - --ANSWER --(1) A close cluster or mix of small particles of soil and/or organic matter of varying sizes that are bonded together; sand, gravel, or small rocks in soil; and/or sand, gravel, or small rocks used under paved surfaces. (2) Clusters of