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Crop Science Reviewer for the Agriculturist Licensure Examination

Crop Science is the largest single block on most AgLE papers and the one candidates under-prepare for, because it spans plant physiology and genetics at one end and field practice, biotechnology and current policy at the other.

1,400 free practice questions · 4 topics · every answer explained · no account needed

Start reviewing Crop Science

What Crop Science covers on the board exam

  • How plants capture light, move water and partition assimilate — photosynthesis, transpiration, translocation and the growth stages these drive.
  • Inheritance, selection and the conventional breeding methods behind released varieties.
  • Agricultural biotechnology: tissue culture, marker-assisted selection, transgenic crops and the regulatory questions that follow them.
  • Sustainable and organic production systems, and the trade-offs between yield, soil health and input cost.
  • Current news and developments a 2026 examinee is expected to recognise.

Study note. Biotechnology and current-news items reward recognition rather than derivation. Work them in short, frequent sittings and keep the longer sessions for physiology.

Crop Science topics you can review right now

Sample Current News and Concepts questions with answers and explanations

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

  1. A public rice-breeding team in Central Luzon has limited funds and must choose among yield, grain quality, drought tolerance, and bacterial leaf blight resistance. Farmers report that water shortage and disease cause the largest recurring losses, while millers reject chalky grain. Which first step best converts these needs into a defensible breeding objective?

    • A. Begin crossing the highest-yielding parents without documenting farmer or market requirements.
    • B. Select only for drought survival and assume grain quality can be corrected after release.
    • C. Define a weighted product profile that specifies target environments, minimum resistance, acceptable grain quality, and yield thresholds. correct
    • D. Increase the number of crosses while keeping the desired traits and target area undefined.

    Why: A breeding objective should translate stakeholder needs into measurable, prioritized traits for a defined target population of environments. This prevents selection for yield alone from producing an unacceptable or poorly adapted cultivar.

  2. Vegetable growers in Benguet need a cabbage cultivar for warmer planting windows, but traders also demand compact heads that withstand transport. Which strategy best protects the program from improving one trait at the expense of the other?

    • A. Use a selection index that assigns explicit weights to heat adaptation, marketable head quality, and transportability. correct
    • B. Release any line with large heads before testing performance under warm conditions.
    • C. Choose parents solely from the coolest high-elevation trial site.
    • D. Select the earliest plants only because maturity is easiest to measure.

    Why: A multi-trait selection index balances adaptation and market traits and makes trade-offs explicit. Single-trait selection can cause undesirable correlated responses or poor market acceptance.

  3. An open-pollinated corn improvement program serves upland smallholders who recycle seed and apply modest fertilizer. Candidate populations were developed under high-input irrigation. What change in the breeding plan is most important before release?

    • A. Use only laboratory seedling measurements because field conditions are too variable.
    • B. Increase fertilizer rates further to reveal the maximum genetic yield potential.
    • C. Evaluate and select the populations under representative low-input, rainfed farmer environments. correct
    • D. Replace population improvement with production of a single elite inbred line.

    Why: Selection environments should represent the target production system. Genotype-by-environment interaction can make high-input rankings unreliable for low-input rainfed farms.

  4. A breeder proposes a tomato cultivar with outstanding yield but poor firmness for a processing market that requires mechanical handling. Which decision is most defensible?

    • A. Release it immediately because total yield overrides all quality requirements.
    • B. Ignore firmness because processors can correct genetic defects through storage.
    • C. Retain the line as a parent but do not release it until firmness and processing quality meet minimum standards. correct
    • D. Discard all yield data and select only for fruit color in the next cycle.

    Why: Release decisions require a complete product profile. A line may be valuable as germplasm even when it fails a non-negotiable end-use requirement.

Practise the full Crop Science bank free

Crop Science reviewer — common questions

Is this Crop Science reviewer free?

Yes. Every Crop Science question, answer and explanation on AgLE Online Review is free to use. There is no account, no sign-up, no trial and no paywall, and the reviewer is open to examinees anywhere in the world.

How many Crop Science questions are there?

The Crop Science bank currently holds 1,400 distinct questions across 4 topics. Every item is a separate question — the count is not padded with reworded copies of the same one.

Can I practise Crop Science by topic?

Yes. Opening Crop Science in the reviewer shows its topics first, and a session can be run on a single topic or across all of them. You can also choose Practice Mode for instant explanations or Exam Mode for timed board conditions.

Are these actual AgLE board questions?

No, and no reviewer that claims otherwise should be trusted. These are board-style practice items written and curated to match the coverage and difficulty of the Agriculturist Licensure Examination. Consult the current PRC Table of Specifications for the official scope.

Review the other AgLE board subjects