ISA Arborist Chapter 1 Exam Questions And
Correct Answers 2025-2026 | Get It Correct !!!
Abscission Zone -
-Correct Answers
Area at the base of the petiole where cellular break
down leads to leaf and fruit drop.
Absorbing root -
-Correct Answers
Fine,fibrous roots that take up water and minerals. Most
absorbing roots are within the top 12 inches (30cm) of
soil.
Adventitious bud -
-Correct Answers
Bud arising from a place other than a leaf axil or shoot
tip,usually as a result of hormonal triggers.
Aerial root -
-Correct Answers
Aboveground roots. Usually adventitious in nature and
sometimes having unique adaptive functions.
Angiosperm -
-Correct Answers
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.
1
,Anthocyanin -
-Correct Answers
Red or purple pigment responsible for those colors in
some parts of trees and other plants. Compare to
carotenoid.
Antitranspirant -
-Correct Answers
Substance applied to the foliage of plants to reduce
water loss(transpiration)
Apical bud -
-Correct Answers
Bud at the tip of a twig or shoot.
Apical dominance -
-Correct Answers
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 Answers
Growing point at the tips of shoots and roots.
Apoplasm -
-Correct Answers
Free spaces in plant tissue. Includes cell walls and
intracellular spaces. Contrast with Symplasm.
2
, Auxin -
-Correct Answers
Plant hormone or substance that promotes or regulates
the growth and development of plants. Produced at
sites were cells are dividing,primarily in the shoot tips.
Auxin-like compounds may be synthetically produced.
Axial transport -
-Correct Answers
Movement of water,minerals or Photosynthates
longitudinally with in a tree.
Axillary bud -
-Correct Answers
Bud in the axil of a leaf. Lateral bud.
Branch bark ridge -
-Correct Answers
Raised strip of bark at the top of a branch union, where
the growth and expansion of the trunk or parent stem
and adjoining branch push the bark into a ridge.
Branch collar -
-Correct Answers
Area were a branch joins another branch or trunk that is
created by the over lapping vascular tissues from both
the branch and the trunk. Typically enlarged at the base
of the branch.
Bud -
-Correct Answers
3
Correct Answers 2025-2026 | Get It Correct !!!
Abscission Zone -
-Correct Answers
Area at the base of the petiole where cellular break
down leads to leaf and fruit drop.
Absorbing root -
-Correct Answers
Fine,fibrous roots that take up water and minerals. Most
absorbing roots are within the top 12 inches (30cm) of
soil.
Adventitious bud -
-Correct Answers
Bud arising from a place other than a leaf axil or shoot
tip,usually as a result of hormonal triggers.
Aerial root -
-Correct Answers
Aboveground roots. Usually adventitious in nature and
sometimes having unique adaptive functions.
Angiosperm -
-Correct Answers
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.
1
,Anthocyanin -
-Correct Answers
Red or purple pigment responsible for those colors in
some parts of trees and other plants. Compare to
carotenoid.
Antitranspirant -
-Correct Answers
Substance applied to the foliage of plants to reduce
water loss(transpiration)
Apical bud -
-Correct Answers
Bud at the tip of a twig or shoot.
Apical dominance -
-Correct Answers
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 Answers
Growing point at the tips of shoots and roots.
Apoplasm -
-Correct Answers
Free spaces in plant tissue. Includes cell walls and
intracellular spaces. Contrast with Symplasm.
2
, Auxin -
-Correct Answers
Plant hormone or substance that promotes or regulates
the growth and development of plants. Produced at
sites were cells are dividing,primarily in the shoot tips.
Auxin-like compounds may be synthetically produced.
Axial transport -
-Correct Answers
Movement of water,minerals or Photosynthates
longitudinally with in a tree.
Axillary bud -
-Correct Answers
Bud in the axil of a leaf. Lateral bud.
Branch bark ridge -
-Correct Answers
Raised strip of bark at the top of a branch union, where
the growth and expansion of the trunk or parent stem
and adjoining branch push the bark into a ridge.
Branch collar -
-Correct Answers
Area were a branch joins another branch or trunk that is
created by the over lapping vascular tissues from both
the branch and the trunk. Typically enlarged at the base
of the branch.
Bud -
-Correct Answers
3
