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Botanical researchers studying the Aquilaria tree have confirmed that its production of agarwood—a dense, resinous heartwood—is an immunological response to a specific fungal infection. In Aquilaria trees that have never been infected, the heartwood remains light and completely odorless. Experimental inoculations revealed that the final total volume of agarwood produced by an infected tree is determined exclusively by the number of distinct fungal infection sites on its trunk. However, the researchers also observed that the ambient humidity of the tree's environment dictates the speed at which the fungus spreads; this spread rate directly determines how rapidly the tree initiates its resin production.

Which one of the following is most strongly supported by the researchers' findings?

  1. Two Aquilaria trees grown in environments with entirely different ambient humidity levels could nonetheless produce the same final volume of agarwood.Answer
  2. B
    Any Aquilaria tree that contains agarwood must have been intentionally inoculated with the fungus by researchers.
  3. C
    If an infected Aquilaria tree is grown in an environment with low ambient humidity, its heartwood will remain light and completely odorless.
  4. D
    Most Aquilaria trees that are exposed to the specific fungus will eventually develop multiple distinct infection sites on their trunks.
  5. E
    The specific fungus responsible for agarwood production spreads more rapidly in high-humidity environments because increased moisture facilitates fungal spore reproduction.

Answer

Two Aquilaria trees grown in environments with entirely different ambient humidity levels could nonetheless produce the same final volume of agarwood.
The correct statement is logically derived from the explicit rules in the stimulus. The text states that the final total volume of agarwood is determined 'exclusively' by the number of distinct fungal infection sites. It also states that ambient humidity dictates the 'speed' of the spread and how rapidly production initiates. Because humidity only affects the timeline and the final volume is governed exclusively by infection sites, it is entirely possible for two trees in different humidity environments to have the same number of infection sites and, consequently, the exact same final volume of agarwood.

Step-by-Step Solution

1
Analyze the premises provided in the stimulus.
Identified two independent relationships: 1) Final volume of agarwood is exclusively determined by the number of infection sites. 2) Ambient humidity determines the speed of fungal spread and how rapidly resin production begins.
Deconstructing the stimulus into individual facts is required to see what can be logically proven.
2
Evaluate the relationship between volume, infection sites, and humidity.
Humidity affects the rate of production but has no stated effect on the final volume, which is strictly governed by the number of infection sites.
Understanding the boundaries of these causal rules allows us to synthesize a valid inference.
3
Assess the correct statement against the established relationships.
The correct statement is fully supported because two trees with different humidity levels (affecting only speed) could have the same number of infection sites, resulting in the same final volume.
The correct answer must be provable based strictly on the text, without assuming outside information.

Key Concept

Synthesizing independent rules to determine what must or could be true, while carefully distinguishing between factors that affect rate versus those that affect total quantity.
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