Free Certified Crop Adviser (CCA) Exam Questions and Answers
Certified Crop Adviser (CCA) is an Agriculture and Food Safety certification exam. This page has free practice questions for it with answers and explanations, set out the way the real exam asks them, plus a timed practice test that scores you against the pass mark.
Candidates comparing Certified Crop Adviser (CCA) exam dumps, ExamTopics and other practice tests use this page for the answers and explanations behind each question. Download the free PDF, then sit the timed exam simulation before booking with Agriculture and Food Safety.
Last updated: October 20, 2026
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Question #1
A soil test report lists the following exchangeable cations in cmol(c)/kg: Ca 7.2, Mg 1.8, K 0.4, Na 0.1, and exchangeable acidity (H + Al) 4.5. The CEC is determined by summation of cations. What is the approximate base saturation of this soil?
Correct answer: C
Explanation
Basic cations total 7.2 + 1.8 + 0.4 + 0.1 = 9.5 cmol(c)/kg. Adding the 4.5 of exchangeable acidity gives a CEC of 14.0, so base saturation = 9.5 / 14.0 = 67.9%, or about 68%. The 32% value is the acid saturation, and 64% counts only Ca and Mg as bases.
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Question #2
Which of the following is a variable cost in corn production?
Correct answer: C
Explanation
Variable costs change with the level of production inputs, such as fertilizer, seed and chemicals, and can be avoided if the crop is not planted. Land rent, depreciation and property tax are fixed costs that occur regardless of how many acres are planted or what rate is applied.
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Question #3
A soil test on a field going to alfalfa shows a pH of 5.5, a buffer pH indicating a lime requirement of 3 tons/ac, Ca 2,400 ppm (high), and Mg 40 ppm (very low). Which liming material should the adviser recommend?
Correct answer: C
Explanation
Dolomitic limestone neutralizes acidity and also supplies magnesium, which corrects the very low Mg test. Calcitic limestone and hydrated lime would raise pH but add essentially only Ca. Gypsum supplies Ca and S without raising soil pH.
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Question #4
Which stem characteristic is typical of sedges and helps distinguish them from grasses?
Correct answer: B
Explanation
Sedges have triangular, solid stems, which is summarized by the saying "sedges have edges." Grasses have round or flattened stems that are usually hollow between prominent nodes. Square stems are characteristic of the mint family.
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Question #5
A grower harvests winter wheat in late June and immediately no-till plants soybeans into the stubble for harvest the same fall. What is this cropping system called?
Correct answer: B
Explanation
Double cropping is growing two crops in sequence on the same land in one year, with the second planted after the first is harvested. In relay cropping the second crop is planted into the standing first crop before it is harvested. Strip cropping alternates crops in bands, usually for erosion control.
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Question #6
In humid weather, a grower finds tan to gray, rectangular lesions on the lower leaves of corn planted into corn residue under no-till. The lesions run parallel to the leaf veins and are 0.5 to 2 in. long with straight, vein-limited edges. Which disease is MOST likely?
Correct answer: C
Explanation
Gray leaf spot produces narrow rectangular lesions restricted by the veins, favored by humid weather and corn residue in corn-on-corn no-till. Northern corn leaf blight has long cigar-shaped lesions with tapered ends. Common rust forms raised brick-red pustules, and Goss's wilt shows water-soaked freckles at the lesion edges.
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Question #7
The permanent wilting point is conventionally defined as a soil matric potential of about:
Correct answer: B
Explanation
Permanent wilting point is conventionally taken as -1,500 kPa (-15 bar), below which most crop plants cannot extract water. Field capacity is about -33 kPa (-1/3 bar) in medium-textured soils. Available water is the water held between those two values.
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Question #8
The U.S. EPA maximum contaminant level for nitrate in public drinking water, expressed as nitrate-nitrogen, is how many mg/L?
Correct answer: C
Explanation
The standard is 10 mg/L nitrate-N, set to protect infants from methemoglobinemia. The figure of 45 mg/L is the same limit expressed as nitrate (NO3) rather than as nitrate-N, which is a frequent mix-up.
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Question #9
Which landscape position most commonly has the thickest topsoil because of deposition of eroded material?
Correct answer: A
Explanation
Footslopes and toeslopes receive sediment and water from upslope, building thick, dark surface horizons. Shoulders and backslopes lose soil to erosion, and summits are generally stable with moderate profile depth.
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Question #10
The normalized difference vegetation index (NDVI) used in crop imagery is calculated from reflectance in which two wavebands?
Correct answer: C
Explanation
NDVI = (NIR - Red)/(NIR + Red). Healthy leaves absorb red light for photosynthesis and strongly reflect near-infrared, so the contrast tracks canopy vigor and biomass.
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FAQ
- Q1: What is the Certified Crop Adviser (CCA) exam?
- A: Certified Crop Adviser (CCA) is a professional examination offered by Agriculture and Food Safety.
- Q2: Are there practice questions for Certified Crop Adviser (CCA)?
- A: Yes. The first ten are free to read with their answers and no account is needed; the rest of the bank and the practice test come with access to the exam.
- Q3: How should I prepare for Certified Crop Adviser (CCA)?
- A: Start from the official Agriculture and Food Safety exam objectives, which define what is actually tested, and practise against questions written to them rather than to a syllabus someone has guessed at.