Refer to the Figure Below

question 211

Multiple Choice

Refer to the figure below. The graph shows results from a study on a pathogen that infects and destroys grape plants.The pathogen reproduces asexually to form spores.These spores are easily transported by wind to new plant hosts to begin a new round of infection.In this study, scientists infected grape vine plants with viable spores and placed the plants in a vineyard.The scientists then collected spores that were produced from this infection.They collected some spores at various times on hot, dry days and collected other spores at various times on cool, cloudy days.Then they tested both sets of spores to see how well they caused infection in a new round of host plants.Which statement can be made about this study?

• A) This was a comparative experiment because it was conducted using living plants in a field study.
• B) This was a controlled experiment because only one variable differed between the two sets of spores.
• C) This was a comparative experiment because the viabilities of two sets of spores were being compared.
• D) This was a controlled experiment because the plants being studied were limited to a certain number.
• E) This was both a comparative and a controlled experiment because it was conducted in a field while specific variables were kept constant.