Final answer:
In the plant growth experiment associating wind with light, the independent variable is the wind from the fan, and the dependent variable is the plant growth direction. The experiment tests if plants can learn this association and grow towards the fan when only wind is presented.
Step-by-step explanation:
Understanding Variables in Experiments
In the described experiment, where plants were trained to associate light with the wind created by a fan, the independent variable is the condition being manipulated by the experimenters, which is the wind from the fan. The hypothesis suggests that plants may learn to associate wind with light and direct their growth accordingly. After the training phase with both wind and light present, the plant is placed in a maze and only exposed to the fan. In this phase of the experiment, the plant's growth direction in response to the fan alone is observed. The dependent variable here is the direction of the plant growth.
The experiment aims to see if the previous association (training) influences the plant's growth toward the fan in anticipation of light, which is absent in this phase of the experiment. Any other potential influences on plant growth, such as soil quality, water availability, and temperature, should be controlled to ensure that the resulting plant behavior is indeed due to the manipulated independent variable.