ISA Arborist Chapter 1 questions with correct answers

Abscission Zone CORRECT ANSWER Area at the base of the petiole where cellular break down leads to leaf and fruit drop. Absorbing root CORRECT ANSWER Fine, fibrous roots that take up water and minerals. Most absorbing roots are within the top 12 inches (30cm) of soil. Adventitious bud CORRECT ANSWER Bud arising from a place other than a leaf axil or shoot tip, usually as a result of hormonal triggers. Aerial root CORRECT ANSWER Aboveground roots. Usually adventitious in nature and sometimes having unique adaptive functions. Angiosperm CORRECT ANSWER Plant with seeds borne in an ovary. Consist of two large groups: Monocotyledons (grasses, palms, and related plants) and dicotyledons (most woody trees, shrubs, herbaceous plants, and related plants). Contrast with gymnosperms. Anthocyanin CORRECT ANSWER Red or purple pigment responsible for those colors in some parts of trees and other plants. Compare to carotenoid. Antitranspirant CORRECT ANSWER Substance applied to the foliage of plants to reduce water loss(transpiration) Apical bud CORRECT ANSWER Bud at the tip of a twig or shoot. Apical dominance CORRECT ANSWER Condition in which the terminal bud inhibits the growth and development of the lateral buds on the same stem formed during the same season. Apical meristem CORRECT ANSWER Growing point at the tips of shoots and roots. Apoplasm CORRECT ANSWER Free spaces in plant tissue. Includes cell walls and intracellular spaces. Contrast with Symplasm. Auxin CORRECT ANSWER Plant hormone or substance that pro