Arborist Certification Chapter 1 2025/2026 QUESTIONS AND
ANSWERS GUARANTEE A+
axial transport - movement of water, minerals, or photosynthate longitudinally within a tree
axillary bud - bud in the axil of a leaf; lateral bud
branch bark ridge - top area of a tree's crotch where the growth and development of the two
adjoining limbs push the bark into a ridge
branch collar - area where a branch joins another branch or trunk created by the overlapping
xylem tissues
buds - small lateral or terminal protuberance on the stem of a plant that may develop into a
flower or shoot; underdeveloped flower or shot
cambium - layer(s) of meristematic cells that give rise to the phloem and xylem and allow for
diameter increase in a tree
carbohydrate - compound, combining carbon and water, produced by plants during
photosynthesis
carotenoids - a yellow, orange or red pigment responsible for those colors in some parts of the
trees and other plants
chlorophyll - a green pigment of plants, found in chloroplasts; it captures the energy of the sun
and is essential in photosynthesis
chloroplast - specialized organelle found in some cells; the site of photosynthesis
, CODIT - Compartmentalization Of Decay In Trees
companion cell - parenchyma cells associated with sieve tube members
compartmentalization - natural process of defense in trees by which they wall off decay in the
wood
cork cambium - meristematic tissue from which cork and bark develop to the outside
cuticle - waxy layer outside the epidermis of a leaf
cytokinin - plant hormone involved in cell division
deciduous - tress or other plant that loses its leaves sometime during the year and stays leafless
generally during the cold season
decurrent - rounded or spreading growth habit of the crown of a tree
differentiation - process in the development of cells in which they become specialized for various
functions
diffuse porous - pattern of wood development in which the vessels are distributed evenly
throughout the annual ring
dormant - state of reduced physiological activity in the organs of a plant
epicormic - arising from latent or adventitious buds
ANSWERS GUARANTEE A+
axial transport - movement of water, minerals, or photosynthate longitudinally within a tree
axillary bud - bud in the axil of a leaf; lateral bud
branch bark ridge - top area of a tree's crotch where the growth and development of the two
adjoining limbs push the bark into a ridge
branch collar - area where a branch joins another branch or trunk created by the overlapping
xylem tissues
buds - small lateral or terminal protuberance on the stem of a plant that may develop into a
flower or shoot; underdeveloped flower or shot
cambium - layer(s) of meristematic cells that give rise to the phloem and xylem and allow for
diameter increase in a tree
carbohydrate - compound, combining carbon and water, produced by plants during
photosynthesis
carotenoids - a yellow, orange or red pigment responsible for those colors in some parts of the
trees and other plants
chlorophyll - a green pigment of plants, found in chloroplasts; it captures the energy of the sun
and is essential in photosynthesis
chloroplast - specialized organelle found in some cells; the site of photosynthesis
, CODIT - Compartmentalization Of Decay In Trees
companion cell - parenchyma cells associated with sieve tube members
compartmentalization - natural process of defense in trees by which they wall off decay in the
wood
cork cambium - meristematic tissue from which cork and bark develop to the outside
cuticle - waxy layer outside the epidermis of a leaf
cytokinin - plant hormone involved in cell division
deciduous - tress or other plant that loses its leaves sometime during the year and stays leafless
generally during the cold season
decurrent - rounded or spreading growth habit of the crown of a tree
differentiation - process in the development of cells in which they become specialized for various
functions
diffuse porous - pattern of wood development in which the vessels are distributed evenly
throughout the annual ring
dormant - state of reduced physiological activity in the organs of a plant
epicormic - arising from latent or adventitious buds
