Question

the passage below describes an experiment.

image: a bouquet of roses in a vase

james is a florist. he wants to make sure his bouquets are staying fresh for as long as possible. james read that sugar will feed the bouquets and keep them fresh. he prepared six vases with water and added a fresh bouquet of roses to each. in two of the vases he mixed one - half cup of soda with the water. in two others he mixed one - fourth cup of soda with the water. james observed how much the bouquets in each vase wilted over one week.

in this experiment, which were part of an experimental group?

• the vases with water and one - fourth cup of soda
• the vases with only water

Explanation:

In an experiment, the experimental group is the one that receives the treatment (in this case, the addition of soda to water). The vases with water and one - fourth cup of soda are given a treatment (the soda), while the vases with only water would be the control group (not receiving the experimental treatment of soda addition). The vases with one - half cup of soda also are experimental, but among the given options, the vases with water and one - fourth cup of soda are part of the experimental group as they have the treatment (soda) added.

Answer:

the vases with water and one - fourth cup of soda