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Difficulty: MediumResolving Paradoxes and Apparent Discrepancies

In 2025, an agricultural cooperative in Colombia introduced a dense shade-tree canopy across its member farms to protect organic coffee crops from intense summer heat. Agricultural sensors confirmed that the canopy successfully reduced crop microclimate temperatures by several degrees during peak summer months, eliminating heat stress on the plants. Furthermore, total rainfall and soil nutrient levels remained identical to historical averages. Nevertheless, during the summer harvest, the average yield of harvestable coffee beans per acre across these farms fell by nearly 20 percent compared to previous unshaded years.

Which of the following, if true, most helps to account for the unexpected decrease in coffee bean yield?

  1. The shade-tree canopy provided an ideal nesting habitat for a local bird species that feeds heavily on ripening coffee cherries just prior to harvest.Answer
  2. B
    The reduction in microclimate temperature lowered soil evaporation rates, allowing farmers to reduce supplemental irrigation without stressing the crops.
  3. C
    Non-organic coffee farms in the same region that did not plant shade trees suffered severe crop damage from high summer temperatures.
  4. D
    Consumer demand for organic coffee shifted toward lower-priced conventional coffee during the summer harvest period.
  5. E
    The cooperative expanded its total cultivated land area by 25 percent over the course of the three years prior to planting the shade trees.

Answer

The resolution is that the new shade-tree canopy created a habitat for a bird species that consumed a significant portion of the ripening coffee cherries before they could be harvested.
The correct answer provides an unintended consequence of installing the shade canopy: attracting birds that ate mature coffee cherries. This explains why physical plant health and reduced heat stress did not translate into higher harvested yield, resolving both facts simultaneously.

Step-by-Step Solution

1
Identify the two conflicting facts presented in the stimulus.
Fact 1: The shade canopy successfully lowered temperatures and eliminated heat stress under stable moisture and nutrient conditions. Fact 2: Despite these favorable growing conditions, the per-acre yield of harvestable coffee beans dropped by 20%.
Resolving a paradox requires understanding both facts without disputing either one.
2
Determine the required mechanism for resolution.
A valid resolution must introduce a new factor associated with the shade canopy or lower temperatures that negatively impacts harvestable yield despite healthy plant growth.
The correct option must reconcile the reduced yield with the absence of heat, water, or nutrient stress.
3
Evaluate the choices to find the statement that explains the discrepancy.
The option noting that the shade canopy attracted seed-eating birds explains how healthy crops produced fewer harvestable beans due to pre-harvest consumption by birds.
This bridges the gap between healthy plant growth and lower harvested output.

Key Concept

Resolving Paradoxes and Apparent Discrepancies
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Topics

Resolving Paradoxes and Apparent Discrepancies

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