Arborist Certification Chapter 1
2025/2026 Exam Questions and Correct
Answers | New Update
Abscission Zone - 🧠ANSWER ✔✔area at the base of the petiole where
cellular breakdown leads to leaf drop
Absorbing Roots - 🧠ANSWER ✔✔fine, fibrous roots that take up water and
minerals, most of them are within the top 12 inches (30 cm) of soil
Adventitious Bud - 🧠ANSWER ✔✔bud that arises from a place other than a
leaf axil
Anthocyanins - 🧠ANSWER ✔✔red, purple, or blue pigments, responsible
for those colors in some parts of trees an other plants
antitranspirant - 🧠ANSWER ✔✔substance sprayed on plants to reduce
water loss through the foliage
, apical bud - 🧠ANSWER ✔✔terminal bud on a stem
apical dominance - 🧠ANSWER ✔✔condition in which the terminal bud
inhibits the growth and development of lateral buds on the same stem
apical meristem - 🧠ANSWER ✔✔the growing points at the tips of shoots
auxin - 🧠ANSWER ✔✔plant hormone or substance that promotes or
regulates the growth and development of plants; it is produced at sites
where cells are dividing, primarily in the shoot tips
axial transport - 🧠ANSWER ✔✔movement of water, minerals, or
photosynthate longitudinally within a tree
axillary bud - 🧠ANSWER ✔✔bud in the axil of a leaf; lateral bud
branch bark ridge - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔area where a branch joins another branch or
trunk created by the overlapping xylem tissues
2025/2026 Exam Questions and Correct
Answers | New Update
Abscission Zone - 🧠ANSWER ✔✔area at the base of the petiole where
cellular breakdown leads to leaf drop
Absorbing Roots - 🧠ANSWER ✔✔fine, fibrous roots that take up water and
minerals, most of them are within the top 12 inches (30 cm) of soil
Adventitious Bud - 🧠ANSWER ✔✔bud that arises from a place other than a
leaf axil
Anthocyanins - 🧠ANSWER ✔✔red, purple, or blue pigments, responsible
for those colors in some parts of trees an other plants
antitranspirant - 🧠ANSWER ✔✔substance sprayed on plants to reduce
water loss through the foliage
, apical bud - 🧠ANSWER ✔✔terminal bud on a stem
apical dominance - 🧠ANSWER ✔✔condition in which the terminal bud
inhibits the growth and development of lateral buds on the same stem
apical meristem - 🧠ANSWER ✔✔the growing points at the tips of shoots
auxin - 🧠ANSWER ✔✔plant hormone or substance that promotes or
regulates the growth and development of plants; it is produced at sites
where cells are dividing, primarily in the shoot tips
axial transport - 🧠ANSWER ✔✔movement of water, minerals, or
photosynthate longitudinally within a tree
axillary bud - 🧠ANSWER ✔✔bud in the axil of a leaf; lateral bud
branch bark ridge - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔area where a branch joins another branch or
trunk created by the overlapping xylem tissues
