Principles of Crop Protection (Weed Science) — Crop Protection Reviewer Questions

350 board-style Principles of Crop Protection (Weed Science) items for the Agriculturist Licensure Examination. Try 40 questions free; lifetime access is ₱49. Group pesticides by mode of action rather than by trade name. The examination asks about resistance management far more often than about products.

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Sample Principles of Crop Protection (Weed Science) questions with answers and explanations

Board-style items taken from the Crop Protection bank. Every answer is explained, which is the part that makes a review question worth doing twice.

A crop-protection student reviews this field note: A specialist is assigned to study unwanted plants in crop fields and determine how to manage them. Which option best matches the concept being tested?
- A. Plant pathology
- B. Soil taxonomy
- C. Weed science correct
- D. Entomology
Why: Weed science is a field of crop protection centered on weeds, their biology, and their control.
A student is interpreting this observation: A selective organic herbicide historically important to the development of weed science is being discussed. Which conclusion best explains it?
- A. Sulfur
- B. 2,4-D correct
- C. Glyphosate
- D. Copper sulfate
Why: The module identifies 2,4-D (2,4-dichlorophenoxyacetic acid) as an important selective herbicide in the history of weed science.
During field scouting in a Philippine farm, this situation is observed: A very low concentration of 2,4-D is described as behaving like a natural plant growth regulator. What should the technician conclude or do?
- A. Cytokinin destruction
- B. Ethylene blockage
- C. Auxin-type activity correct
- D. Gibberellin inhibition
Why: 2,4-D is a synthetic auxin; at very low concentration it can act like a growth regulator.
During a Weed Science review, the following observation is given: A susceptible broadleaf weed exposed to a herbicidal dose of 2,4-D develops abnormal, uncontrolled growth before dying. Which answer is correct?
- A. Root pruning
- B. Synthetic-auxin herbicidal action correct
- C. Nutrient deficiency
- D. Mechanical abrasion
Why: At herbicidal doses, auxin-mimicking herbicides disrupt normal growth regulation and cause abnormal growth in susceptible weeds.
Consider this field situation: Farm workers remove young weeds by hand before they set seed. Which statement gives the best weed-science interpretation?
- A. Manual control correct
- B. Genetic control
- C. Biological control
- D. Chemical control
Why: Hand pulling or hand weeding is a manual weed-control method.
A farmer needs to act on this observation: A rice farmer adjusts crop spacing and planting practices so the crop closes its canopy faster than the weeds. Which option is the best application of weed-science principles?
- A. Chemical control
- B. Cultural control correct
- C. Biological control
- D. Manual control
Why: Cultural control changes crop or field practices to make the crop more competitive or the environment less favorable to weeds.
A field identification card states: A cultivator or hoe physically uproots weeds between crop rows. Which weed-science term or fact fits it best?
- A. Biological control
- B. Regulatory control
- C. Chemical control
- D. Mechanical control correct
Why: Mechanical control uses implements or physical disturbance to remove or damage weeds.
A farmer asks why this observation matters: A highly host-specific natural enemy is evaluated to suppress an invasive weed population. Which explanation is most accurate?
- A. Chemical control
- B. Manual control
- C. Fertilizer management
- D. Biological control correct
Why: Biological weed control uses living organisms or their effects to suppress weeds.

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Principles of Crop Protection (Weed Science) — Crop Protection Reviewer Questions

Sample Principles of Crop Protection (Weed Science) questions with answers and explanations

A crop-protection student reviews this field note: A specialist is assigned to study unwanted plants in crop fields and determine how to manage them. Which option best matches the concept being tested?

A student is interpreting this observation: A selective organic herbicide historically important to the development of weed science is being discussed. Which conclusion best explains it?

During field scouting in a Philippine farm, this situation is observed: A very low concentration of 2,4-D is described as behaving like a natural plant growth regulator. What should the technician conclude or do?

During a Weed Science review, the following observation is given: A susceptible broadleaf weed exposed to a herbicidal dose of 2,4-D develops abnormal, uncontrolled growth before dying. Which answer is correct?

Consider this field situation: Farm workers remove young weeds by hand before they set seed. Which statement gives the best weed-science interpretation?

A farmer needs to act on this observation: A rice farmer adjusts crop spacing and planting practices so the crop closes its canopy faster than the weeds. Which option is the best application of weed-science principles?

A field identification card states: A cultivator or hoe physically uproots weeds between crop rows. Which weed-science term or fact fits it best?

A farmer asks why this observation matters: A highly host-specific natural enemy is evaluated to suppress an invasive weed population. Which explanation is most accurate?

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