Question 18

The primary purpose of the passage about domesticated crops is to consider whether the plant-vigor hypothesis might explain recent research findings concerning the parasitization of certain herbivorous moths.

The passage centers on evaluating the plant-vigor hypothesis in relation to new research findings about how certain herbivorous moths interact with domesticated crops, specifically regarding their parasitization.

A) suggest that selection for gigantism in plants may have certain unexpected long-term benefits

This option is incorrect because the passage does not focus on the selection for gigantism or its long-term benefits. Instead, it examines the implications of the plant-vigor hypothesis, which is unrelated to gigantism.

B) account for previously overlooked correlation between insect-ivore egg-laying on flowers and flower size

This option is also incorrect. The passage does not address the correlation between insect-ivore egg-laying and flower size. Instead, it concentrates on the relationship between the vigor of domesticated crops and the parasitization of moths.

C) challenge the idea that domestication of certain crops may contribute to changes in species that depend on those crops

While this option suggests a potential argument against the effects of domestication, it does not capture the main focus of the passage. The passage specifically explores the plant-vigor hypothesis rather than challenging the broader implications of crop domestication.

D) consider whether the plant-vigor hypothesis might explain recent research findings concerning the parasitization of certain herbivorous moths

This option is correct because it accurately reflects the passage's aim to investigate the plant-vigor hypothesis in the context of recent findings related to herbivorous moths and their parasitization patterns.

Conclusion

The correct answer, D, effectively encapsulates the primary purpose of the passage, which is to analyze the plant-vigor hypothesis in light of new research on herbivorous moths. Other options either misrepresent the focus of the passage or address unrelated concepts, thereby confirming that they do not fulfill the question's requirement.