Certified Crop Advisor (CCA) Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which nutrient is most commonly associated with leaf yellowing
starting at the tip and moving along the midrib?
A. Nitrogen
B. Phosphorus
C. Potassium
D. Calcium
Rationale: Potassium deficiency typically causes chlorosis at leaf margins
and tips, progressing along the midrib.
2. What is the primary benefit of using cover crops in cropping systems?
A. Increase pesticide resistance
B. Reduce soil erosion and improve soil health
,C. Increase seed size
D. Decrease rainfall
Rationale: Cover crops help reduce soil erosion, increase organic matter,
and improve soil structure.
3. Which soil texture holds the most water available to plants?
A. Sand
B. Loam
C. Clay
D. Silt
Rationale: Loam balances sand, silt, and clay, retaining water while
allowing drainage.
4. When calibrating a sprayer, what is the most important factor to ensure
accurate application?
A. Pump pressure only
B. Nozzle color only
C. Flow rate and travel speed
D. Tank size
Rationale: Accurate calibration depends on matching flow rate to travel
speed to achieve intended application rate.
5. Which of the following is a symptom of nitrogen deficiency?
A. Interveinal chlorosis on older leaves
B. Purple stems and leaves
,C. Uniform yellowing of older leaves
D. Leaf tip necrosis
Rationale: Nitrogen is mobile; deficiency symptoms appear on older leaves
first as yellowing.
6. Phosphorus deficiency in plants typically results in:
A. Leaf tip burn
B. Stunted growth and dark green or purplish leaves
C. Wilting
D. Necrotic spots
Rationale: Phosphorus deficiency slows growth and can cause purple
coloration due to anthocyanin accumulation.
7. Which of the following practices most effectively reduces nutrient
leaching?
A. Deep tillage
B. Overhead irrigation
C. Split fertilizer applications
D. Fall plowing
Rationale: Splitting fertilizer applications reduces the risk of nutrients
being washed beyond the root zone.
8. What is the ideal soil pH range for most crops?
A. 4.5–5.0
B. 6.0–7.0
, C. 7.5–8.5
D. 5.0–5.5
Rationale: Most crops grow best in slightly acidic to neutral soils (6.0–7.0).
9. Which irrigation method is most efficient for reducing water loss?
A. Flood irrigation
B. Furrow irrigation
C. Drip irrigation
D. Sprinkler irrigation
Rationale: Drip irrigation delivers water directly to the root zone,
minimizing evaporation and runoff.
10. Herbicide resistance management includes which practice?
A. Applying herbicides only once per season
B. Rotating modes of action
C. Increasing herbicide rates indefinitely
D. Planting the same crop repeatedly
Rationale: Rotating herbicide modes of action reduces the likelihood of
developing resistant weed populations.
11. Which soil property most strongly affects nutrient availability?
A. Color
B. Texture
C. pH
D. Temperature
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which nutrient is most commonly associated with leaf yellowing
starting at the tip and moving along the midrib?
A. Nitrogen
B. Phosphorus
C. Potassium
D. Calcium
Rationale: Potassium deficiency typically causes chlorosis at leaf margins
and tips, progressing along the midrib.
2. What is the primary benefit of using cover crops in cropping systems?
A. Increase pesticide resistance
B. Reduce soil erosion and improve soil health
,C. Increase seed size
D. Decrease rainfall
Rationale: Cover crops help reduce soil erosion, increase organic matter,
and improve soil structure.
3. Which soil texture holds the most water available to plants?
A. Sand
B. Loam
C. Clay
D. Silt
Rationale: Loam balances sand, silt, and clay, retaining water while
allowing drainage.
4. When calibrating a sprayer, what is the most important factor to ensure
accurate application?
A. Pump pressure only
B. Nozzle color only
C. Flow rate and travel speed
D. Tank size
Rationale: Accurate calibration depends on matching flow rate to travel
speed to achieve intended application rate.
5. Which of the following is a symptom of nitrogen deficiency?
A. Interveinal chlorosis on older leaves
B. Purple stems and leaves
,C. Uniform yellowing of older leaves
D. Leaf tip necrosis
Rationale: Nitrogen is mobile; deficiency symptoms appear on older leaves
first as yellowing.
6. Phosphorus deficiency in plants typically results in:
A. Leaf tip burn
B. Stunted growth and dark green or purplish leaves
C. Wilting
D. Necrotic spots
Rationale: Phosphorus deficiency slows growth and can cause purple
coloration due to anthocyanin accumulation.
7. Which of the following practices most effectively reduces nutrient
leaching?
A. Deep tillage
B. Overhead irrigation
C. Split fertilizer applications
D. Fall plowing
Rationale: Splitting fertilizer applications reduces the risk of nutrients
being washed beyond the root zone.
8. What is the ideal soil pH range for most crops?
A. 4.5–5.0
B. 6.0–7.0
, C. 7.5–8.5
D. 5.0–5.5
Rationale: Most crops grow best in slightly acidic to neutral soils (6.0–7.0).
9. Which irrigation method is most efficient for reducing water loss?
A. Flood irrigation
B. Furrow irrigation
C. Drip irrigation
D. Sprinkler irrigation
Rationale: Drip irrigation delivers water directly to the root zone,
minimizing evaporation and runoff.
10. Herbicide resistance management includes which practice?
A. Applying herbicides only once per season
B. Rotating modes of action
C. Increasing herbicide rates indefinitely
D. Planting the same crop repeatedly
Rationale: Rotating herbicide modes of action reduces the likelihood of
developing resistant weed populations.
11. Which soil property most strongly affects nutrient availability?
A. Color
B. Texture
C. pH
D. Temperature
