ALPP CLC EXAM AND STUDY GUIDE QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a Certified Landscape
Contractor (CLC)?
A. To design architectural buildings
B. To manage and execute landscaping projects professionally
C. To inspect food safety systems
D. To regulate mining operations
Rationale: A CLC focuses on planning, installation, and
maintenance of landscape systems.
Correct Answer: B
2. Which soil type has the highest water retention?
A. Sandy soil
B. Clay soil
C. Gravel soil
D. Siltless soil
Rationale: Clay particles are small and tightly packed, holding
more water.
Correct Answer: B
,3. What is the main function of mulch in landscaping?
A. Increase soil salinity
B. Prevent weed growth and retain moisture
C. Speed up erosion
D. Compact soil layers
Rationale: Mulch conserves moisture and suppresses weeds.
Correct Answer: B
4. Which irrigation system is most water-efficient?
A. Flood irrigation
B. Sprinkler irrigation
C. Drip irrigation
D. Hose irrigation
Rationale: Drip irrigation delivers water directly to roots,
reducing waste.
Correct Answer: C
5. What does pH measure in soil?
A. Soil temperature
B. Soil moisture
C. Acidity or alkalinity
D. Nutrient density
Rationale: pH indicates acidity or alkalinity of soil.
Correct Answer: C
,6. Which nutrient is primarily responsible for leaf growth?
A. Phosphorus
B. Nitrogen
C. Potassium
D. Calcium
Rationale: Nitrogen promotes vegetative (leaf) growth.
Correct Answer: B
7. What is erosion?
A. Soil formation process
B. Movement of soil by wind or water
C. Plant fertilization
D. Soil compaction
Rationale: Erosion is the removal and transport of soil.
Correct Answer: B
8. Which tool is commonly used for soil aeration?
A. Pruner
B. Trowel
C. Aerator
D. Rake only
, Rationale: Aerators create holes to improve air flow in soil.
Correct Answer: C
9. What is the ideal pH range for most turf grasses?
A. 2–3
B. 4–5
C. 6–7
D. 9–10
Rationale: Most turf grasses thrive in slightly acidic to neutral
soil.
Correct Answer: C
10. Which of the following is a perennial plant?
A. Maize
B. Beans
C. Grass
D. Wheat
Rationale: Perennials live for multiple years.
Correct Answer: C
11. What is the function of fertilizer?
A. Reduce soil fertility
B. Supply essential nutrients to plants
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a Certified Landscape
Contractor (CLC)?
A. To design architectural buildings
B. To manage and execute landscaping projects professionally
C. To inspect food safety systems
D. To regulate mining operations
Rationale: A CLC focuses on planning, installation, and
maintenance of landscape systems.
Correct Answer: B
2. Which soil type has the highest water retention?
A. Sandy soil
B. Clay soil
C. Gravel soil
D. Siltless soil
Rationale: Clay particles are small and tightly packed, holding
more water.
Correct Answer: B
,3. What is the main function of mulch in landscaping?
A. Increase soil salinity
B. Prevent weed growth and retain moisture
C. Speed up erosion
D. Compact soil layers
Rationale: Mulch conserves moisture and suppresses weeds.
Correct Answer: B
4. Which irrigation system is most water-efficient?
A. Flood irrigation
B. Sprinkler irrigation
C. Drip irrigation
D. Hose irrigation
Rationale: Drip irrigation delivers water directly to roots,
reducing waste.
Correct Answer: C
5. What does pH measure in soil?
A. Soil temperature
B. Soil moisture
C. Acidity or alkalinity
D. Nutrient density
Rationale: pH indicates acidity or alkalinity of soil.
Correct Answer: C
,6. Which nutrient is primarily responsible for leaf growth?
A. Phosphorus
B. Nitrogen
C. Potassium
D. Calcium
Rationale: Nitrogen promotes vegetative (leaf) growth.
Correct Answer: B
7. What is erosion?
A. Soil formation process
B. Movement of soil by wind or water
C. Plant fertilization
D. Soil compaction
Rationale: Erosion is the removal and transport of soil.
Correct Answer: B
8. Which tool is commonly used for soil aeration?
A. Pruner
B. Trowel
C. Aerator
D. Rake only
, Rationale: Aerators create holes to improve air flow in soil.
Correct Answer: C
9. What is the ideal pH range for most turf grasses?
A. 2–3
B. 4–5
C. 6–7
D. 9–10
Rationale: Most turf grasses thrive in slightly acidic to neutral
soil.
Correct Answer: C
10. Which of the following is a perennial plant?
A. Maize
B. Beans
C. Grass
D. Wheat
Rationale: Perennials live for multiple years.
Correct Answer: C
11. What is the function of fertilizer?
A. Reduce soil fertility
B. Supply essential nutrients to plants
