Current News and Concepts — Crop Science Reviewer Questions

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.

5. A mungbean program seeks stable yield, short maturity, and synchronized pod set for rice-based systems where the crop must fit between two rice seasons. Which trait combination should receive the greatest emphasis?

   • A. Large seed size alone without testing duration or adaptation to the rotation.
   • B. Late maturity and indeterminate flowering to prolong pod production.
   • C. High yield within a short, synchronized maturity window under residual-soil-moisture conditions. correct
   • D. Maximum vegetative biomass even when harvest extends into the next rice season.

   Why: The breeding objective must match the cropping calendar. Short, synchronized maturity and performance under residual moisture determine whether mungbean can fit the rice-based system.

6. A sugarcane program is responding to red-striped soft scale insect pressure while maintaining recoverable sugar and ratoon performance. Which evaluation rule is strongest?

   • A. Advance the least infested clone even if its sugar recovery is commercially unacceptable.
   • B. Choose the tallest clone from one plant-cane trial and omit ratoon testing.
   • C. Advance clones only when pest tolerance, cane yield, sugar recovery, and ratoon performance are jointly acceptable across infested sites. correct
   • D. Apply insecticide uniformly and rank clones without recording pest pressure.

   Why: A commercially useful sugarcane cultivar must combine tolerance with yield, quality, and ratooning ability. Multi-site evaluation under documented pest pressure separates true host response from escape or chemical suppression.

7. A national breeding project wants to improve iron concentration in rice without reducing farmer yield or consumer acceptance. Which breeding objective is most appropriate?

   • A. Select only dark-colored grains because color guarantees high iron concentration.
   • B. Maximize iron concentration regardless of yield, maturity, or eating quality.
   • C. Measure iron after varietal release rather than during line advancement.
   • D. Set minimum targets for grain iron while retaining competitive yield, cooking quality, and adaptation. correct

   Why: Biofortification is most useful when nutritional gain is combined with agronomic and consumer acceptability. Grain color is not a reliable substitute for nutrient analysis.

8. A breeder has ten promising drought-tolerant rice lines but only enough resources for three multi-location trials. Which prioritization method best uses the available resources?

   • A. Choose three lines from the same family to simplify seed multiplication.
   • B. Randomly select lines so breeder judgment cannot influence the outcome.
   • C. Send the three tallest lines because plant height is an inexpensive proxy for drought yield.
   • D. Use preliminary replicated data and trait thresholds to select genetically diverse lines with the strongest combination of drought response, yield, and quality. correct

   Why: Stage-gate selection should combine reliable preliminary evidence with diversity and product-profile thresholds. Choosing close relatives or a weak proxy can reduce the chance of identifying broadly useful material.

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Other Crop Science topics

• Agricultural Biotechnology — 400 questions
• Sustainable Agriculture — 250 questions
• Plant Breeding: Conventional Methods — 250 questions

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