Question

the passage below describes a process of scientific inquiry. select the part of the passage that describes revising the hypothesis.
crown gall tumors on a rose stem
carmen grew roses for a flower shop. one day, she noticed tumor - like growths on her rose stems. she read a book about plant diseases and learned that the plants had crown gall disease, which is caused by a type of bacteria. she also read that allicin, a chemical found in garlic, can kill bacteria. she was curious if garlic could prevent more tumors from forming on her plants. carmen sprayed garlic juice on ten infected plants and water on another ten. after one month, she compared the number of new tumors on plants in each group and found no difference between them. carmen thought that the concentration of allicin in her garlic spray might be too low, so spraying the plants with pure allicin would decrease the number of new tumors. she repeated her experiment, this time spraying the plants with a solution of pure allicin.

Explanation:

Carmen initially hypothesized garlic could prevent new tumors. After the first - experiment showed no difference, she adjusted her hypothesis to think pure allicin (higher concentration) would decrease new tumors. The key part is her changing the hypothesis based on the initial experiment results.

Answer:

Carmen thought that the concentration of allicin in her garlic spray might be too low, so spraying the plants with pure allicin would decrease the number of new tumors.