Question

scarlett grew roses for a flower shop. one day, she noticed tumor-like growths on her rose stems. she could tell that the plants had crown gall disease, which is caused by a type of bacteria. she knew that allicin, a chemical in garlic, can kill bacteria. scarlett wondered if spraying her plants with garlic juice would prevent more tumors from forming on her plants. once a day, scarlett sprayed garlic juice on ten infected plants and left another 10 infected plants unsprayed. after one month, she compared the number of new tumors on plants in the two groups.
complete the sentence.
in this experiment, the roses sprayed with garlic juice were part of ____________.

a control group

an experimental group

(image caption: crown gall tumors on a rose stem)

Explanation:

In an experiment, the experimental group is the one that receives the treatment (here, spraying with garlic juice) to test the effect of the treatment. The control group is the one that does not receive the treatment. Since the roses sprayed with garlic juice got the treatment (garlic juice) being tested, they are part of the experimental group.

Answer:

an experimental group