Question 33 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC
A student conducted an experiment to test whether talking to plants would help them to grow faster. He set up the following two groups:Group 1: spoken to and hand watered Group 2: not spoken to and watered with sprinklers After three weeks, the plants in Group 1 showed much more growth than those in Group 2. Based on the results of this experiment, which is the best conclusion?
Answer
A
They are valid because the student ran a controlled experiment.
B
They are not valid because the student did not control all the variables that can affect plant growth.
C
They are valid because the dependent variable caused a change in the independent variable.
D
They are not valid because the time frame to grow a plant is too short.
Explanation
The groups differed in two ways: Group 1 was spoken to and hand watered, while Group 2 was not spoken to and was watered with sprinklers. Because the watering method was not kept the same, the student cannot tell whether talking, watering, or both caused the difference in growth. The conclusion is not valid because not all variables affecting plant growth were controlled.
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