Plant tropisms are mechanisms by which plants adapt to environmental changes. A tropism is a growth toward or away from a stimulus. ... Plant hormones, like auxins, are thought to help regulate the differential growth of a plant organ, causing the plant to curve or bend in response to a stimulus.

Why are tropisms important to plants?

Plants need light and water for photosynthesis . They have developed responses called tropisms to help make sure they grow towards sources of light and water. Positive tropism is when a plant grows towards the stimulus .

How do tropisms help plants survive?

Instead, plants survive by adjusting their growth to their local environment. A major way this is done is by sensing the directions of environmental signals such as light and gravity. This sensory information is then used to orient the direction of growth toward or away from a stimulus in a process called a tropism.