Certified Crop Advisor Exam Practice Questions
And Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which of the following is the primary macronutrient required in
the largest quantity for plant growth?
a. Iron
b. Zinc
c. Nitrogen
d. Manganese
Nitrogen is a primary macronutrient essential for vegetative growth and
is required in the largest amounts by plants.
2. The pH of a soil primarily affects:
a. Soil texture
b. Nutrient availability
c. Organic matter content
d. Soil depth
Soil pH influences the solubility of nutrients, affecting plant uptake and
potential deficiencies or toxicities.
3. Leguminous crops improve soil fertility mainly through:
a. Photosynthesis
b. Irrigation
c. Nitrogen fixation
d. Weed suppression
Legumes form symbiotic relationships with Rhizobium bacteria, which
convert atmospheric nitrogen into forms plants can use.
, 4. Which of the following is considered a micronutrient?
a. Nitrogen
b. Phosphorus
c. Potassium
d. Boron
Boron is required in very small quantities but is essential for cell wall
formation and reproductive growth.
5. The term “field capacity” refers to:
a. The soil moisture when the soil is completely dry
b. The point of wilting
c. The amount of water remaining after excess has drained
d. Total precipitation
Field capacity is the water content held in the soil after gravitational
water has drained, available for plants.
6. Which practice reduces soil erosion most effectively?
a. Tillage
b. Cover cropping
c. Overgrazing
d. Removing crop residue
Cover crops protect soil from wind and water erosion and improve soil
structure.
7. The main purpose of a soil test is to:
a. Determine soil texture
b. Assess nutrient levels for fertilization decisions
c. Measure soil depth
d. Identify soil organisms
, Soil tests help determine nutrient deficiencies or excesses and guide
fertilizer applications.
8. Which irrigation method is considered most water-efficient?
a. Flood
b. Furrow
c. Drip
d. Sprinkler
Drip irrigation delivers water directly to the root zone, minimizing losses
from evaporation or runoff.
9. The C:N ratio in compost affects:
a. Soil pH
b. Rate of decomposition
c. Soil texture
d. Pest resistance
A high carbon-to-nitrogen (C:N) ratio slows decomposition, while a low
ratio speeds it up.
10. Which of the following is a symptom of nitrogen deficiency?
a. Purple leaf edges
b. Yellowing of older leaves
c. Leaf curling
d. Necrotic spots on young leaves
Nitrogen is mobile in the plant, so deficiency symptoms appear first on
older leaves as chlorosis.
11. Which tillage practice minimizes soil disturbance and helps
retain organic matter?
a. Conventional plowing
And Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which of the following is the primary macronutrient required in
the largest quantity for plant growth?
a. Iron
b. Zinc
c. Nitrogen
d. Manganese
Nitrogen is a primary macronutrient essential for vegetative growth and
is required in the largest amounts by plants.
2. The pH of a soil primarily affects:
a. Soil texture
b. Nutrient availability
c. Organic matter content
d. Soil depth
Soil pH influences the solubility of nutrients, affecting plant uptake and
potential deficiencies or toxicities.
3. Leguminous crops improve soil fertility mainly through:
a. Photosynthesis
b. Irrigation
c. Nitrogen fixation
d. Weed suppression
Legumes form symbiotic relationships with Rhizobium bacteria, which
convert atmospheric nitrogen into forms plants can use.
, 4. Which of the following is considered a micronutrient?
a. Nitrogen
b. Phosphorus
c. Potassium
d. Boron
Boron is required in very small quantities but is essential for cell wall
formation and reproductive growth.
5. The term “field capacity” refers to:
a. The soil moisture when the soil is completely dry
b. The point of wilting
c. The amount of water remaining after excess has drained
d. Total precipitation
Field capacity is the water content held in the soil after gravitational
water has drained, available for plants.
6. Which practice reduces soil erosion most effectively?
a. Tillage
b. Cover cropping
c. Overgrazing
d. Removing crop residue
Cover crops protect soil from wind and water erosion and improve soil
structure.
7. The main purpose of a soil test is to:
a. Determine soil texture
b. Assess nutrient levels for fertilization decisions
c. Measure soil depth
d. Identify soil organisms
, Soil tests help determine nutrient deficiencies or excesses and guide
fertilizer applications.
8. Which irrigation method is considered most water-efficient?
a. Flood
b. Furrow
c. Drip
d. Sprinkler
Drip irrigation delivers water directly to the root zone, minimizing losses
from evaporation or runoff.
9. The C:N ratio in compost affects:
a. Soil pH
b. Rate of decomposition
c. Soil texture
d. Pest resistance
A high carbon-to-nitrogen (C:N) ratio slows decomposition, while a low
ratio speeds it up.
10. Which of the following is a symptom of nitrogen deficiency?
a. Purple leaf edges
b. Yellowing of older leaves
c. Leaf curling
d. Necrotic spots on young leaves
Nitrogen is mobile in the plant, so deficiency symptoms appear first on
older leaves as chlorosis.
11. Which tillage practice minimizes soil disturbance and helps
retain organic matter?
a. Conventional plowing
