Exam Questions And Correct Answers

Certified Crop Advisor (CCA) Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which macronutrient is most commonly associated with vegetative

growth in plants?

• Phosphorus
• Potassium
• Nitrogen
• Calcium

Nitrogen is essential for vegetative growth because it is a major component of amino acids, proteins, and chlorophyll.

• A soil test indicates low available phosphorus. Which fertilizer source

would be most appropriate?

• Ammonium nitrate
• Triple superphosphate 1 / 4

• Potassium chloride
• Urea

Triple superphosphate contains high levels of phosphorus, which directly addresses phosphorus deficiency.

• Which soil property most affects water infiltration rate?
• Soil color
• Soil texture
• Soil pH
• Organic matter

Soil texture (proportion of sand, silt, and clay) determines porosity and thus water infiltration rates.

• Which pest is an example of a fungal disease affecting crops?
• Aphid
• Powdery mildew
• Root-knot nematode
• Leafhopper

Powdery mildew is caused by fungal pathogens and is common in many crops.

• What is the primary purpose of crop rotation?
• Increase pesticide use
• Reduce pest and disease pressure
• Increase irrigation needs
• Promote monoculture 2 / 4

Rotating crops helps disrupt pest and disease life cycles, improving soil health.

• Which nutrient deficiency often causes interveinal chlorosis in leaves?
• Potassium
• Nitrogen
• Magnesium
• Calcium

Magnesium deficiency disrupts chlorophyll production, leading to yellowing between leaf veins.

• What is the main advantage of conservation tillage?
• Increases soil erosion
• Reduces organic matter
• Reduces soil erosion and improves water retention
• Increases weed pressure

Conservation tillage minimizes soil disturbance, helping retain residue, reduce erosion, and improve soil moisture.

• Which factor is most important in determining plant nutrient

availability?

• Leaf color
• Soil pH
• Seed size
• Air temperature 3 / 4

Soil pH affects nutrient solubility and availability; most nutrients are available in the pH range of 6–7.

• Which irrigation method is most efficient in water use?
• Furrow irrigation
• Flood irrigation
• Drip irrigation
• Sprinkler irrigation

Drip irrigation delivers water directly to the root zone, reducing evaporation and runoff losses.

• Which practice helps minimize nitrate leaching?
• Applying nitrogen in a single spring application
• Avoiding cover crops
• Split nitrogen applications
• Flood irrigation

Split applications of nitrogen match plant demand and reduce the risk of leaching during heavy rainfall.

• What is the main role of potassium in plants?
• Protein synthesis
• Water regulation and enzyme activation
• Chlorophyll production
• Seed formation only

Potassium regulates stomatal opening and enzyme activation, influencing water use efficiency and growth.

• / 4