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 leafy growth in
crops?
A. Phosphorus
B. Potassium
C. Nitrogen
D. Calcium
Rationale: Nitrogen is essential for vegetative growth and is a key component of
amino acids and chlorophyll, promoting leaf development.
2. The best soil test method for estimating available phosphorus in alkaline
soils is:
A. Bray P1
B. Olsen
C. Mehlich 3
D. Olsen
Rationale: The Olsen method is designed for neutral to alkaline soils and
provides a reliable estimate of plant-available phosphorus.
3. Crop rotation is primarily used to:
A. Increase pesticide use
, B. Deplete soil nutrients
C. Reduce pest and disease pressure
D. Increase monoculture yield
Rationale: Rotating crops interrupts pest and disease cycles and can improve soil
health and fertility.
4. What is the primary symptom of potassium deficiency in corn?
A. Purpling of lower leaves
B. Yellowing and browning of leaf edges
C. Stunted root growth
D. Interveinal chlorosis on young leaves
Rationale: Potassium deficiency typically causes marginal chlorosis (yellowing)
and necrosis (browning) on older leaves.
5. The term “field capacity” refers to:
A. Soil completely dry
B. Soil moisture after excess water has drained
C. Soil saturated with water
D. Permanent wilting point
Rationale: Field capacity is the water content remaining after gravity drainage,
which is available for plants.
6. Which of the following is a micronutrient needed in very small amounts?
A. Nitrogen
B. Phosphorus
C. Potassium
D. Zinc
Rationale: Micronutrients like zinc, iron, manganese, and copper are required in
small quantities for plant enzymatic functions.
7. In integrated pest management (IPM), the first step is usually to:
A. Apply pesticides
B. Monitor pest populations
, C. Introduce natural enemies
D. Rotate crops
Rationale: Monitoring allows for informed decisions on whether pest control is
necessary and which methods to use.
8. Soil texture is determined primarily by:
A. Soil color
B. Proportion of sand, silt, and clay
C. Organic matter content
D. Soil pH
Rationale: Soil texture affects water retention, aeration, and nutrient
availability.
9. A soil pH of 5.0 indicates:
A. Neutral soil
B. Slightly alkaline
C. Acidic soil
D. Highly saline soil
Rationale: pH values below 7 indicate acidic conditions, which can affect nutrient
availability.
10.Nitrogen in the soil is most readily available to plants as:
A. Nitrate and ammonium
B. Urea only
C. Nitrogen gas
D. Nitrate and ammonium
Rationale: Plants absorb nitrogen primarily as nitrate (NO₃⁻) and ammonium
(NH₄⁺).
11.Which irrigation method is most efficient in minimizing water loss?
A. Flood irrigation
B. Sprinkler irrigation
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. Which macronutrient is most commonly associated with leafy growth in
crops?
A. Phosphorus
B. Potassium
C. Nitrogen
D. Calcium
Rationale: Nitrogen is essential for vegetative growth and is a key component of
amino acids and chlorophyll, promoting leaf development.
2. The best soil test method for estimating available phosphorus in alkaline
soils is:
A. Bray P1
B. Olsen
C. Mehlich 3
D. Olsen
Rationale: The Olsen method is designed for neutral to alkaline soils and
provides a reliable estimate of plant-available phosphorus.
3. Crop rotation is primarily used to:
A. Increase pesticide use
, B. Deplete soil nutrients
C. Reduce pest and disease pressure
D. Increase monoculture yield
Rationale: Rotating crops interrupts pest and disease cycles and can improve soil
health and fertility.
4. What is the primary symptom of potassium deficiency in corn?
A. Purpling of lower leaves
B. Yellowing and browning of leaf edges
C. Stunted root growth
D. Interveinal chlorosis on young leaves
Rationale: Potassium deficiency typically causes marginal chlorosis (yellowing)
and necrosis (browning) on older leaves.
5. The term “field capacity” refers to:
A. Soil completely dry
B. Soil moisture after excess water has drained
C. Soil saturated with water
D. Permanent wilting point
Rationale: Field capacity is the water content remaining after gravity drainage,
which is available for plants.
6. Which of the following is a micronutrient needed in very small amounts?
A. Nitrogen
B. Phosphorus
C. Potassium
D. Zinc
Rationale: Micronutrients like zinc, iron, manganese, and copper are required in
small quantities for plant enzymatic functions.
7. In integrated pest management (IPM), the first step is usually to:
A. Apply pesticides
B. Monitor pest populations
, C. Introduce natural enemies
D. Rotate crops
Rationale: Monitoring allows for informed decisions on whether pest control is
necessary and which methods to use.
8. Soil texture is determined primarily by:
A. Soil color
B. Proportion of sand, silt, and clay
C. Organic matter content
D. Soil pH
Rationale: Soil texture affects water retention, aeration, and nutrient
availability.
9. A soil pH of 5.0 indicates:
A. Neutral soil
B. Slightly alkaline
C. Acidic soil
D. Highly saline soil
Rationale: pH values below 7 indicate acidic conditions, which can affect nutrient
availability.
10.Nitrogen in the soil is most readily available to plants as:
A. Nitrate and ammonium
B. Urea only
C. Nitrogen gas
D. Nitrate and ammonium
Rationale: Plants absorb nitrogen primarily as nitrate (NO₃⁻) and ammonium
(NH₄⁺).
11.Which irrigation method is most efficient in minimizing water loss?
A. Flood irrigation
B. Sprinkler irrigation
