Relationship among details

Untimed practice

Question 1

Urban ecologists have proposed that rooftop gardens containing a wider variety of flowering plants may attract more pollinators. To test the proposal, a research team randomly assigned 40 similar rooftop gardens in one city to two conditions: 20 gardens contained three flowering plant species, and 20 contained nine species. During standardized observation periods, the gardens with nine species received a median of 39 pollinator visits, compared with 24 visits to the gardens with three species. All of the gardens were located in the same city and were observed during a single flowering season. The results suggest that, under the conditions studied, greater flowering-plant variety can increase pollinator visits to rooftop gardens.

Which choice best describes the relationship between the study’s intervention and its measured outcome?

AThe researchers only surveyed existing gardens and did not assign them to different plant-variety conditions. BThe researchers deliberately varied both flowering-plant variety and the number of pollinator visits. CThe researchers varied the number of pollinator visits and then measured flowering-plant variety. DThe researchers varied flowering-plant variety and then measured pollinator visits.

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