Certified Crop Advisor (CCA) Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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What is not an essential nutrient for plants?
Na/sodium
Which of the following plant nutrients is a cation in soils?
potassium/K+
Which of the following is a macronutrient? Cu, S, Mg, B
Sulfur
Which element regulates stomatal openings in plants?
Potassium, K
Which nutrient is most immobile in soil?
phosphate
What is the chemical uptake form of nitrogen?
NO3-
What is the chemical uptake form of phosphorous?
H2PO4-
What is the chemical uptake form of potassium?
,k+
At which growth stage are nutrients in the greatest demand?
vegatative
Which of the following in a micronutrient? Cu, Ca, Mg, S
Cu, Copper
At which growth stage would you expect the highest demand for soil nutrients?
mid-veg
What is the least available source of nutrients?
soil minerals
If a nutrient is released into the soil during decomposition of an organic material what
has occurred?
mineralization
When a plant nutrient is absorbed with water that is moving to and into the plant root,
the nutrient uptake process is called ________.
mass flow
A major way calcium is supplied to plants is by _________.
cation exchange
Which of the following is more mobile in a flooded soil than in an upland soil?
manganese
Which of the following structures would likely have the lowest soil fertility?
sand
Which of the following nutrient uptake mechanism is most important after a rainfall
event?
mass flow
Which of the following is not needed for rapid nitrification to occur?
nitrate
Conditions which favor volatile losses of nitrogen?
high temperature
Denitrification is the conversion of ___________ gaseous forms like denitrogen and
oxides of nitrogen?
nitrate
, Symbiotic nitrogen fixation is the process where atmospheric nitrogen is converted to
ammonia in the root nodules of?
legumes
A condition which favors symbiotic nitrogen fixation is?
low soil nitrate
Immobilization of inorganic N during decomposition will be most likely if the material
decomposing has a C:N ratio of...?
35
In which of the following cases would you expect the greatest nitrogen mineralization?
amended with bio-solid
Which of the following forms of K is most available to plants?
solution
Which of the following situations would you most likely expect potassium deficiency?
20% clay, pH 8.3, double cropped
split application of nitrogen compared to one pass of the same rate provide what
advantage?
reduce leaching loss
If a legume is grown in rotation with a grain crop, the nitrogen fertilizer rate for the grain
crop will be ___________ as compared to a monoculture of the grain crop.
reduced
The keys to reducing the amounts of fertilizer nitrogen entering ground and surface
waters are to _______ crop uptake and to _____ loss pathways such as leaching and
runoff.
maximize, minimize
Which of the following is responsible for decreased P availability at high soil PH?
calcium phosphate precipitates
Which of the following is the best measure of plant available P in a soil?
soil test P
Extensive use of which of the following soil amendments is most likely to induce K
deficiency?
aglime
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
What is not an essential nutrient for plants?
Na/sodium
Which of the following plant nutrients is a cation in soils?
potassium/K+
Which of the following is a macronutrient? Cu, S, Mg, B
Sulfur
Which element regulates stomatal openings in plants?
Potassium, K
Which nutrient is most immobile in soil?
phosphate
What is the chemical uptake form of nitrogen?
NO3-
What is the chemical uptake form of phosphorous?
H2PO4-
What is the chemical uptake form of potassium?
,k+
At which growth stage are nutrients in the greatest demand?
vegatative
Which of the following in a micronutrient? Cu, Ca, Mg, S
Cu, Copper
At which growth stage would you expect the highest demand for soil nutrients?
mid-veg
What is the least available source of nutrients?
soil minerals
If a nutrient is released into the soil during decomposition of an organic material what
has occurred?
mineralization
When a plant nutrient is absorbed with water that is moving to and into the plant root,
the nutrient uptake process is called ________.
mass flow
A major way calcium is supplied to plants is by _________.
cation exchange
Which of the following is more mobile in a flooded soil than in an upland soil?
manganese
Which of the following structures would likely have the lowest soil fertility?
sand
Which of the following nutrient uptake mechanism is most important after a rainfall
event?
mass flow
Which of the following is not needed for rapid nitrification to occur?
nitrate
Conditions which favor volatile losses of nitrogen?
high temperature
Denitrification is the conversion of ___________ gaseous forms like denitrogen and
oxides of nitrogen?
nitrate
, Symbiotic nitrogen fixation is the process where atmospheric nitrogen is converted to
ammonia in the root nodules of?
legumes
A condition which favors symbiotic nitrogen fixation is?
low soil nitrate
Immobilization of inorganic N during decomposition will be most likely if the material
decomposing has a C:N ratio of...?
35
In which of the following cases would you expect the greatest nitrogen mineralization?
amended with bio-solid
Which of the following forms of K is most available to plants?
solution
Which of the following situations would you most likely expect potassium deficiency?
20% clay, pH 8.3, double cropped
split application of nitrogen compared to one pass of the same rate provide what
advantage?
reduce leaching loss
If a legume is grown in rotation with a grain crop, the nitrogen fertilizer rate for the grain
crop will be ___________ as compared to a monoculture of the grain crop.
reduced
The keys to reducing the amounts of fertilizer nitrogen entering ground and surface
waters are to _______ crop uptake and to _____ loss pathways such as leaching and
runoff.
maximize, minimize
Which of the following is responsible for decreased P availability at high soil PH?
calcium phosphate precipitates
Which of the following is the best measure of plant available P in a soil?
soil test P
Extensive use of which of the following soil amendments is most likely to induce K
deficiency?
aglime
