Taxis, seen in animals, is movement based on a stimulus, such as light while tropism is growth based on a stimulus, seen in plants. These show the difference in how plants and animals go about life: plants are generally fixed in place and respond with growth while animals can move and respond in that way.
Work Step by Step
After finding the two definitions, use the textbook to see how the terms apply to plants and animals. Then think about the big difference in how plants and animals approach the world--sitting and growing or moving about.