Tropism is the growth or movement of a plant in response to environmental stimuli. It can be classified into different types, such as phototropism, where plants grow towards light, and gravitropism, where roots grow downward in response to gravity. These movements help plants optimize their exposure to resources like sunlight and water. Tropisms are essential for a plant's survival and growth. They enable plants to adapt to their surroundings, ensuring they can photosynthesize efficiently and anchor themselves in the soil. Understanding tropism is important in fields like botany and agriculture, as it influences plant health and crop yields.