Correct Answer: To help plants adapt to their environment.
Step 1: Understand what tropisms are. Tropisms are how plants grow in response to different environmental factors.
Step 2: Identify the types of environmental stimuli. These can include light, gravity, water, and touch.
Step 3: Recognize that plants can grow towards (positive tropism) or away from (negative tropism) these stimuli.
Step 4: Realize that the main purpose of tropisms is to help plants survive and thrive by optimizing their growth towards resources like sunlight and water.