After seeing these results, Ella wrote four questions in her lab notebook. Question 1: Why did the water level in the test tube go down?
Question 2: Is light needed to change the water level in the test tube?
Question 3: Did light cause the water level in the test tube to go down?
Question 4: Would a different type of plant change the water level in the test tube?
Ella set up an experiment to investigate one of her questions. She set up one test tube to look like
Figure 1. She set up another test tube similar to Figure 1 but without a lamp, and placed it in a
dark closet. A day later, Ella checked the water level in each test tube.