Examkin

Question

Difficulty: MediumInferences and Implicit Meaning

In early twentieth-century plant ecology, Frederic Clements posited that plant communities develop as integrated superorganisms, progressing through predictable successional stages toward a stable "climax" community determined by regional climate. According to Clements, species within a climax community are so closely co-adapted that the community functions as a discrete biological entity. However, in 1926, botanist Henry Gleason challenged this holistic paradigm by proposing the individualistic concept of plant distribution. Gleason argued that vegetation patterns are merely the probabilistic confluence of individual species responding independently to environmental gradients and dispersal limitations. Rather than forming discrete, tightly coupled communities, species populations fluctuate along environmental continuums without fixed boundaries. While Clements’s superorganism model dominated ecological discourse for decades due to its conceptual elegance and alignment with early conservationist ideals, subsequent empirical studies of pollen records overwhelmingly validated Gleason's continuum hypothesis, demonstrating that plant assemblages are far more transient than Clements maintained.

Which of the following can be inferred from the passage regarding Clements's view of plant communities?

  1. The co-occurrence of particular species within a climax community is not primarily the result of coincidental, independent responses to environmental factors.Answer
  2. B
    Early conservationists adopted Clements's model primarily because it offered practical tools for reversing human-induced forest degradation.
  3. C
    Species within a climax community adjust to environmental gradients in a completely unpredictable manner.
  4. D
    Clements explicitly rejected empirical pollen data because it undermined his commitment to climatic determinism.
  5. E
    Plant assemblages lack fixed boundaries and continuously change across geographic landscapes.

Answer

Clements's view implies that the co-occurrence of species in a climax community is driven by close co-adaptation rather than coincidental, independent environmental responses.
The passage contrasts Gleason's view—that vegetation patterns are probabilistic confluences of independent species responses—with Clements's view of tightly co-adapted species forming an integrated superorganism. Therefore, under Clements's framework, species co-occurrence cannot be primarily a coincidental result of independent environmental responses.

Step-by-Step Solution

1
Analyze the passage description of Clements's model
Clements viewed plant communities as integrated superorganisms with closely co-adapted species forming discrete entities.
Establishing Clements's core framework is necessary to derive its implicit claims.
2
Contrast Clements's view with Gleason's counterargument
Gleason argued that species co-occurrence is merely a probabilistic confluence of independent responses, which directly opposes Clements's holistic co-adaptation concept.
Inference questions on contrasting theories often rely on the logical implication of one theory's negation of the other.
3
Evaluate the statement regarding species co-occurrence
Because Clements saw species as tightly co-adapted into a discrete entity, he implicitly rejected the idea that their co-occurrence was purely coincidental or independent.
This logical deduction directly supports the valid inference.

Key Concept

Inferences and Implicit Meaning
Rate this question

Topics

Inferences and Implicit Meaning

More questions from this topic