The characteristic response of plants to sunlight—growing toward the light—is called positive phototropism. knowing that "trop" is the greek word for "turn," explain why this is an excellent term for this phenomenon.

This term consists of two words with Greek origin: "photo" and "trop". Photo in Greek means light, either sunlight or artificial light. Therefore, the complete word means the turning towards the light. Since the phenomenon under discussion is the plants' natural tendency of orientation towards the light, phototropism is an excellent term.