The plant in the grassland that turns its leaves away from the sun to reduce exposure is the compass plant (Silphium laciniatum).

Here's why:

* Leaf Orientation: Compass plants have leaves that are oriented north-south. This unique arrangement helps them minimize the amount of direct sunlight they receive during the hottest parts of the day, reducing water loss through transpiration.

* Adaptation: This adaptation is particularly useful in grasslands, which are often characterized by hot, dry climates. By minimizing sun exposure, compass plants can conserve precious water resources.

It's important to note that while compass plants are known for their sun-avoiding behavior, they are not the only plants that do this. Other grassland plants may also adjust their leaf angles to some degree, but not as dramatically as compass plants.