Learning Activity

4 of 9

Brain Tropisms

How does your brain react to the stimulating questions below? Find out by selecting your answers from the drop-down lists provided.

	1.	A ___ is an internal or external change that produces a response in an organism.

	2.	___ are movements of plants in response to external stimuli.

	3.	When plants move away from a stimulus, they are exhibiting a ___ tropism.

	4.	When plants turn toward a stimulus, they are exhibiting a ___ tropism.

	5.	Plants on steep slopes still grow vertically because plant stems exhibit ___ gravitropism.

Prefix Practice

Use prefixes as clues to help you identify the term for each tropism. Click on the blue letter of the correct answer.