Certified Crop Advisor (CCA) Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which macronutrient is most commonly associated with vegetative
growth in plants?
A. Phosphorus
B. Potassium
C. Nitrogen
D. Calcium
Nitrogen is essential for vegetative growth because it is a major
component of amino acids, proteins, and chlorophyll.
2. A soil test indicates low available phosphorus. Which fertilizer source
would be most appropriate?
A. Ammonium nitrate
B. Triple superphosphate
, C. Potassium chloride
D. Urea
Triple superphosphate contains high levels of phosphorus, which
directly addresses phosphorus deficiency.
3. Which soil property most affects water infiltration rate?
A. Soil color
B. Soil texture
C. Soil pH
D. Organic matter
Soil texture (proportion of sand, silt, and clay) determines porosity
and thus water infiltration rates.
4. Which pest is an example of a fungal disease affecting crops?
A. Aphid
B. Powdery mildew
C. Root-knot nematode
D. Leafhopper
Powdery mildew is caused by fungal pathogens and is common in
many crops.
5. What is the primary purpose of crop rotation?
A. Increase pesticide use
B. Reduce pest and disease pressure
C. Increase irrigation needs
D. Promote monoculture
, Rotating crops helps disrupt pest and disease life cycles, improving
soil health.
6. Which nutrient deficiency often causes interveinal chlorosis in leaves?
A. Potassium
B. Nitrogen
C. Magnesium
D. Calcium
Magnesium deficiency disrupts chlorophyll production, leading to
yellowing between leaf veins.
7. What is the main advantage of conservation tillage?
A. Increases soil erosion
B. Reduces organic matter
C. Reduces soil erosion and improves water retention
D. Increases weed pressure
Conservation tillage minimizes soil disturbance, helping retain
residue, reduce erosion, and improve soil moisture.
8. Which factor is most important in determining plant nutrient
availability?
A. Leaf color
B. Soil pH
C. Seed size
D. Air temperature
, Soil pH affects nutrient solubility and availability; most nutrients are
available in the pH range of 6–7.
9. Which irrigation method is most efficient in water use?
A. Furrow irrigation
B. Flood irrigation
C. Drip irrigation
D. Sprinkler irrigation
Drip irrigation delivers water directly to the root zone, reducing
evaporation and runoff losses.
10. Which practice helps minimize nitrate leaching?
A. Applying nitrogen in a single spring application
B. Avoiding cover crops
C. Split nitrogen applications
D. Flood irrigation
Split applications of nitrogen match plant demand and reduce the
risk of leaching during heavy rainfall.
11. What is the main role of potassium in plants?
A. Protein synthesis
B. Water regulation and enzyme activation
C. Chlorophyll production
D. Seed formation only
Potassium regulates stomatal opening and enzyme activation,
influencing water use efficiency and growth.
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which macronutrient is most commonly associated with vegetative
growth in plants?
A. Phosphorus
B. Potassium
C. Nitrogen
D. Calcium
Nitrogen is essential for vegetative growth because it is a major
component of amino acids, proteins, and chlorophyll.
2. A soil test indicates low available phosphorus. Which fertilizer source
would be most appropriate?
A. Ammonium nitrate
B. Triple superphosphate
, C. Potassium chloride
D. Urea
Triple superphosphate contains high levels of phosphorus, which
directly addresses phosphorus deficiency.
3. Which soil property most affects water infiltration rate?
A. Soil color
B. Soil texture
C. Soil pH
D. Organic matter
Soil texture (proportion of sand, silt, and clay) determines porosity
and thus water infiltration rates.
4. Which pest is an example of a fungal disease affecting crops?
A. Aphid
B. Powdery mildew
C. Root-knot nematode
D. Leafhopper
Powdery mildew is caused by fungal pathogens and is common in
many crops.
5. What is the primary purpose of crop rotation?
A. Increase pesticide use
B. Reduce pest and disease pressure
C. Increase irrigation needs
D. Promote monoculture
, Rotating crops helps disrupt pest and disease life cycles, improving
soil health.
6. Which nutrient deficiency often causes interveinal chlorosis in leaves?
A. Potassium
B. Nitrogen
C. Magnesium
D. Calcium
Magnesium deficiency disrupts chlorophyll production, leading to
yellowing between leaf veins.
7. What is the main advantage of conservation tillage?
A. Increases soil erosion
B. Reduces organic matter
C. Reduces soil erosion and improves water retention
D. Increases weed pressure
Conservation tillage minimizes soil disturbance, helping retain
residue, reduce erosion, and improve soil moisture.
8. Which factor is most important in determining plant nutrient
availability?
A. Leaf color
B. Soil pH
C. Seed size
D. Air temperature
, Soil pH affects nutrient solubility and availability; most nutrients are
available in the pH range of 6–7.
9. Which irrigation method is most efficient in water use?
A. Furrow irrigation
B. Flood irrigation
C. Drip irrigation
D. Sprinkler irrigation
Drip irrigation delivers water directly to the root zone, reducing
evaporation and runoff losses.
10. Which practice helps minimize nitrate leaching?
A. Applying nitrogen in a single spring application
B. Avoiding cover crops
C. Split nitrogen applications
D. Flood irrigation
Split applications of nitrogen match plant demand and reduce the
risk of leaching during heavy rainfall.
11. What is the main role of potassium in plants?
A. Protein synthesis
B. Water regulation and enzyme activation
C. Chlorophyll production
D. Seed formation only
Potassium regulates stomatal opening and enzyme activation,
influencing water use efficiency and growth.
