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Difficulty: Very hardResolving Paradoxes and Discrepancies

In 2021, the government of Region Y introduced a high-precision satellite irrigation system free of charge to commercial rice farmers, aiming to reduce total groundwater consumption in the agricultural sector. Over the subsequent four years, water metering data confirmed that every participating farm reduced its water usage per metric ton of harvested rice by an average of thirty percent, and no new rice farms were established in the region. Nevertheless, overall agricultural groundwater depletion in Region Y accelerated substantially over the same four-year period.

Which of the following, if true, best reconciles the apparent discrepancy described above?

  1. A
    Industrial manufacturing facilities in Region Y, which draw water from a separate deep-rock aquifer unconnected to agricultural groundwater, also reported increased water consumption over the same four-year period.
  2. Due to the dramatically reduced irrigation cost per unit of yield, participating farmers expanded their total cultivated acreage and shifted to multi-cropping, increasing total annual rice production by eighty percent.Answer
  3. C
    The satellite irrigation technology relies on high-energy local communication relays, leading to a rise in electricity demand that prompted energy utility companies to construct additional power infrastructure.
  4. D
    Public health officials in Region Y observed that the quality of regional groundwater degraded as water tables fell, prompting local municipal authorities to issue strict advisories against drinking raw well water.
  5. E
    Prior to 2021, rice cultivation accounted for over eighty percent of all agricultural groundwater usage across Region Y as a whole.

Answer

The apparent paradox is resolved by the option explaining that lower irrigation costs per unit of yield incentivized farmers to increase overall cultivation scale and crop frequency, causing total water extraction to rise even as per-ton water usage fell.
The correct response identifies the underlying mathematical link between per-unit rate efficiency and overall aggregate volume. If water required per ton of rice decreases by 30%, but overall rice production expands by 80% due to expanded acreage and multi-cropping, the total volume of water drawn from the ground increases significantly. Both facts in the passage remain completely true.

Step-by-Step Solution

1
Identify the two contradictory facts in the stimulus.
Fact 1: Water consumed per metric ton of harvested rice decreased by 30% per farm, with no new farms added. Fact 2: Overall agricultural groundwater depletion in the region accelerated.
Resolving a discrepancy requires clearly isolating the two premise trends that appear mutually exclusive.
2
Analyze the mathematical relationship governing the aggregate rate vs. unit rate.
Total Water Used = (Water Used per Metric Ton) × (Total Metric Tons Produced).
If unit rate decreases, total usage can still increase if total production volume increases at a greater rate.
3
Evaluate the choices for a mechanism that allows both premises to remain true simultaneously.
The explanation noting that farmers expanded acreage and adopted multi-cropping to increase total yield by 80% accounts for a net rise in total water volume extracted despite a 30% increase in per-unit water efficiency.
This bridges the gap between efficiency per unit output and total volume consumed without contradicting either premise.

Key Concept

Rate vs. Total Quantity Discrepancies (Rebound Effect / Jevons Paradox)
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Topics

Resolving Paradoxes and Discrepancies

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