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Difficulty: EasyLogical Inferences

In temperate forests, the decomposing leaves of deciduous trees typically release nutrients, such as nitrogen, back into the soil, promoting the growth of surrounding understory plants. However, in forests dominated by the invasive tree species *Ailanthus altissima* (tree of heaven), the dropped leaves contain high levels of ailanthone, a natural herbicide. Researchers have observed that understory plant diversity is significantly lower in areas colonized by *A. altissima* than in areas dominated by native deciduous trees. Since native plants in these forests rely on soil nutrients but are highly sensitive to chemical inhibitors, this suggests that Which choice most logically completes the text?

  1. the chemical inhibitors released by *A. altissima* leaves prevent many native understory plants from thriving in these colonized areas.Answer
  2. B
    invasive species will eventually replace all native deciduous trees in temperate forests.
  3. C
    deciduous trees generally rely on chemical herbicides to compete with understory plants.
  4. D
    native understory plants are able to neutralize the effects of ailanthone in nitrogen-rich soils.

Answer

the chemical inhibitors released by *A. altissima* leaves prevent many native understory plants from thriving in these colonized areas.
The correct option is supported because the passage notes that native plants are highly sensitive to chemical inhibitors, and the invasive tree *A. altissima* releases a natural herbicide. This explains why understory diversity is lower in areas colonized by the invasive tree.

Step-by-Step Solution

1
Identify the characteristics of native plants and the invasive tree.
Native plants need soil nutrients but are highly sensitive to chemical inhibitors. The leaves of the invasive *A. altissima* release a chemical inhibitor called ailanthone.
This establishes the core relationship between the plants and the chemical environment.
2
Examine the observed outcome in the forest.
Areas with *A. altissima* have significantly lower understory plant diversity compared to areas with native trees.
This links the presence of the invasive species with a negative effect on native plants.
3
Formulate a logical conclusion based on these details.
Because native plants are sensitive to chemical inhibitors and *A. altissima* releases such an inhibitor, the presence of these inhibitors explains the lack of thriving native plants.
This provides a direct, non-speculative inference that logically completes the passage.

Key Concept

Logical Inferences
Estimated Time:1m 0s
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Logical Inferences

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