CERTIFIED ARBORIST EXAMINATION
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1. Which part of a tree is primarily responsible for photosynthesis?
A. Roots
B. Xylem
C. Phloem
D. Leaves
Answer: D. Leaves
Rationale: Leaves contain chlorophyll and are the primary site of
photosynthesis in trees.
2. The vascular tissue that transports water and minerals from roots to leaves
is called:
A. Phloem
B. Cambium
C. Xylem
D. Cortex
Answer: C. Xylem
Rationale: Xylem conducts water and dissolved minerals upward through
the tree.
3. What is the primary function of the phloem?
A. Transport water
B. Transport sugars
C. Structural support
D. Gas exchange
, Answer: B. Transport sugars
Rationale: Phloem distributes carbohydrates produced by photosynthesis
throughout the tree.
4. Which soil texture holds the most water?
A. Sand
B. Silt
C. Loam
D. Clay
Answer: D. Clay
Rationale: Clay particles are very small and retain more water than other
soil textures.
5. A tree that loses its leaves seasonally is described as:
A. Evergreen
B. Deciduous
C. Coniferous
D. Perennial
Answer: B. Deciduous
Rationale: Deciduous trees shed their leaves annually, usually in response
to seasonal changes.
6. What term describes the area where trunk flare meets the soil?
A. Root collar
B. Heartwood
C. Sapwood
D. Crown
Answer: A. Root collar
Rationale: The root collar is the transition zone between trunk and roots
and should be visible above soil.
7. Which pruning cut removes a branch back to its point of origin?
A. Heading cut
B. Reduction cut
C. Thinning cut
, D. Topping cut
Answer: C. Thinning cut
Rationale: Thinning cuts remove branches at their origin to maintain
natural form.
8. Topping a tree is generally discouraged because it:
A. Reduces leaf size
B. Encourages strong branch structure
C. Increases decay and weak growth
D. Improves aesthetics
Answer: C. Increases decay and weak growth
Rationale: Topping causes stress, decay, and poor branch attachment.
9. The best time to prune most trees is:
A. During active growth
B. Late winter or early spring
C. Mid-summer
D. Fall after leaf drop
Answer: B. Late winter or early spring
Rationale: Dormant-season pruning minimizes stress and disease risk.
10.What is included bark?
A. Dead bark
B. Bark trapped between co-dominant stems
C. Bark infected with fungus
D. Loose outer bark
Answer: B. Bark trapped between co-dominant stems
Rationale: Included bark weakens branch unions and increases failure risk.
11.Which pest feeds by sucking sap from leaves and stems?
A. Beetles
B. Caterpillars
C. Aphids
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1. Which part of a tree is primarily responsible for photosynthesis?
A. Roots
B. Xylem
C. Phloem
D. Leaves
Answer: D. Leaves
Rationale: Leaves contain chlorophyll and are the primary site of
photosynthesis in trees.
2. The vascular tissue that transports water and minerals from roots to leaves
is called:
A. Phloem
B. Cambium
C. Xylem
D. Cortex
Answer: C. Xylem
Rationale: Xylem conducts water and dissolved minerals upward through
the tree.
3. What is the primary function of the phloem?
A. Transport water
B. Transport sugars
C. Structural support
D. Gas exchange
, Answer: B. Transport sugars
Rationale: Phloem distributes carbohydrates produced by photosynthesis
throughout the tree.
4. Which soil texture holds the most water?
A. Sand
B. Silt
C. Loam
D. Clay
Answer: D. Clay
Rationale: Clay particles are very small and retain more water than other
soil textures.
5. A tree that loses its leaves seasonally is described as:
A. Evergreen
B. Deciduous
C. Coniferous
D. Perennial
Answer: B. Deciduous
Rationale: Deciduous trees shed their leaves annually, usually in response
to seasonal changes.
6. What term describes the area where trunk flare meets the soil?
A. Root collar
B. Heartwood
C. Sapwood
D. Crown
Answer: A. Root collar
Rationale: The root collar is the transition zone between trunk and roots
and should be visible above soil.
7. Which pruning cut removes a branch back to its point of origin?
A. Heading cut
B. Reduction cut
C. Thinning cut
, D. Topping cut
Answer: C. Thinning cut
Rationale: Thinning cuts remove branches at their origin to maintain
natural form.
8. Topping a tree is generally discouraged because it:
A. Reduces leaf size
B. Encourages strong branch structure
C. Increases decay and weak growth
D. Improves aesthetics
Answer: C. Increases decay and weak growth
Rationale: Topping causes stress, decay, and poor branch attachment.
9. The best time to prune most trees is:
A. During active growth
B. Late winter or early spring
C. Mid-summer
D. Fall after leaf drop
Answer: B. Late winter or early spring
Rationale: Dormant-season pruning minimizes stress and disease risk.
10.What is included bark?
A. Dead bark
B. Bark trapped between co-dominant stems
C. Bark infected with fungus
D. Loose outer bark
Answer: B. Bark trapped between co-dominant stems
Rationale: Included bark weakens branch unions and increases failure risk.
11.Which pest feeds by sucking sap from leaves and stems?
A. Beetles
B. Caterpillars
C. Aphids
