Idaho Wood Preservation Ultimate
Exam
Question 1. **Which part of a tree is most receptive to preservative penetration
due to its living cells?**
A) Heartwood
B) Sapwood
C) Bark
D) Cambium
Answer: B
Explanation: Sapwood contains living, conductive cells that are more porous,
allowing chemicals to diffuse more readily than the dense, dead heartwood.
---
Question 2. **What is the primary structural polymer that provides tensile
strength to wood?**
A) Lignin
B) Hemicellulose
C) Cellulose
D) Pectin
Answer: C
Explanation: Cellulose forms long, crystalline fibers that give wood its high tensile
strength, while lignin adds compressive rigidity.
---
, Idaho Wood Preservation Ultimate
Exam
Question 3. **The fiber saturation point (FSP) of wood is approximately:**
A) 5 % moisture content
B) 12 % moisture content
C) 30 % moisture content
D) 45 % moisture content
Answer: C
Explanation: At about 30 % moisture (by weight) the cell walls are fully saturated,
and any additional water resides in cell cavities.
---
Question 4. **Which drying method typically yields the lowest moisture
variability in lumber?**
A) Air-drying in shade
B) Kiln drying with controlled humidity
C) Sun drying on a roof
D) Microwave drying
Answer: B
Explanation: Kiln drying allows precise control of temperature and humidity,
producing uniform moisture content across the batch.
---
Question 5. **White rot fungi primarily degrade which wood component?**
, Idaho Wood Preservation Ultimate
Exam
A) Cellulose only
B) Hemicellulose only
C) Lignin
D) All three equally
Answer: C
Explanation: White rot fungi possess enzymes that selectively break down lignin,
leaving the cellulose matrix relatively intact.
---
Question 6. **Brown rot fungi are most destructive because they:**
A) Convert lignin into melanin pigments
B) Rapidly depolymerize cellulose, causing cubical cracking
C) Produce a blue-green surface stain
D) Require no oxygen to grow
Answer: B
Explanation: Brown rot fungi rapidly depolymerize cellulose and hemicellulose,
leading to a characteristic crumbly, cubical fracture pattern.
---
Question 7. **Which factor is NOT part of the “Triangle of Rot” that promotes
fungal decay?**
A) Oxygen
, Idaho Wood Preservation Ultimate
Exam
B) Moisture
C) Temperature
D) Light intensity
Answer: D
Explanation: The triangle consists of oxygen, moisture, and temperature (plus a
food source). Light intensity does not directly influence fungal decay.
---
Question 8. **Drywood termites differ from subterranean termites mainly
because they:**
A) Require soil contact for moisture
B) Build mud tubes above ground
C) Live entirely within the wood they consume
D) Feed only on heartwood
Answer: C
Explanation: Drywood termites complete their life cycle inside the wood, needing
no soil contact, unlike subterranean termites that require soil moisture.
---
Question 9. **Which beetle is known for producing fine, powdery frass that
resembles sand?**
A) Lyctid (Powderpost) beetle
Exam
Question 1. **Which part of a tree is most receptive to preservative penetration
due to its living cells?**
A) Heartwood
B) Sapwood
C) Bark
D) Cambium
Answer: B
Explanation: Sapwood contains living, conductive cells that are more porous,
allowing chemicals to diffuse more readily than the dense, dead heartwood.
---
Question 2. **What is the primary structural polymer that provides tensile
strength to wood?**
A) Lignin
B) Hemicellulose
C) Cellulose
D) Pectin
Answer: C
Explanation: Cellulose forms long, crystalline fibers that give wood its high tensile
strength, while lignin adds compressive rigidity.
---
, Idaho Wood Preservation Ultimate
Exam
Question 3. **The fiber saturation point (FSP) of wood is approximately:**
A) 5 % moisture content
B) 12 % moisture content
C) 30 % moisture content
D) 45 % moisture content
Answer: C
Explanation: At about 30 % moisture (by weight) the cell walls are fully saturated,
and any additional water resides in cell cavities.
---
Question 4. **Which drying method typically yields the lowest moisture
variability in lumber?**
A) Air-drying in shade
B) Kiln drying with controlled humidity
C) Sun drying on a roof
D) Microwave drying
Answer: B
Explanation: Kiln drying allows precise control of temperature and humidity,
producing uniform moisture content across the batch.
---
Question 5. **White rot fungi primarily degrade which wood component?**
, Idaho Wood Preservation Ultimate
Exam
A) Cellulose only
B) Hemicellulose only
C) Lignin
D) All three equally
Answer: C
Explanation: White rot fungi possess enzymes that selectively break down lignin,
leaving the cellulose matrix relatively intact.
---
Question 6. **Brown rot fungi are most destructive because they:**
A) Convert lignin into melanin pigments
B) Rapidly depolymerize cellulose, causing cubical cracking
C) Produce a blue-green surface stain
D) Require no oxygen to grow
Answer: B
Explanation: Brown rot fungi rapidly depolymerize cellulose and hemicellulose,
leading to a characteristic crumbly, cubical fracture pattern.
---
Question 7. **Which factor is NOT part of the “Triangle of Rot” that promotes
fungal decay?**
A) Oxygen
, Idaho Wood Preservation Ultimate
Exam
B) Moisture
C) Temperature
D) Light intensity
Answer: D
Explanation: The triangle consists of oxygen, moisture, and temperature (plus a
food source). Light intensity does not directly influence fungal decay.
---
Question 8. **Drywood termites differ from subterranean termites mainly
because they:**
A) Require soil contact for moisture
B) Build mud tubes above ground
C) Live entirely within the wood they consume
D) Feed only on heartwood
Answer: C
Explanation: Drywood termites complete their life cycle inside the wood, needing
no soil contact, unlike subterranean termites that require soil moisture.
---
Question 9. **Which beetle is known for producing fine, powdery frass that
resembles sand?**
A) Lyctid (Powderpost) beetle
