The leaves of a plant will change their orientation as the sun moves across the sky. This is called heliotropism, and it helps the plant maximize its exposure to sunlight for photosynthesis.

Here's how it works:

* During the day: The leaves will generally turn towards the sun, maximizing their surface area exposed to sunlight.

* At night: Some plants will rotate their leaves back to a more vertical position to prevent water loss and damage from the cold.

The specific movement of the leaves depends on the type of plant. Some plants have a more pronounced heliotropic response than others.