How can a plant show both a positive and a negative gravitropism?

A plant exhibits positive gravitropism by growing its roots downward in response to gravity, which helps anchor the plant and access water and nutrients in the soil. Conversely, it shows negative gravitropism by directing its shoots upward, allowing leaves to reach sunlight for photosynthesis. This dual response enables the plant to optimize its growth and survival in its environment, effectively utilizing gravitational cues for directional growth.