Final answer:
The suffix '-tropia' indicates turning or direction inward, often used in biology to describe plant responses to stimuli, or in medicine for eye alignment conditions.
Step-by-step explanation:
The suffix "-tropia" typically indicates turning or direction inward. This can refer to biological responses to stimuli, such as tropisms in plants, where growth is directed by external factors like light (phototropism) or gravity (gravitropism). In medical terms, especially those related to vision, "-tropia" can refer to the alignment of the eyes, such as in esotropia (inward turning of an eye) or exotropia (outward deviation of an eye). Examples of tropisms include gravitropism (growth in response to gravity), phototropism (growth toward light), and thigmotropism (growth in response to touch).