You searched for: “geotaxis
geotaxis
1. A locomotor movement by an animal in response to a gravitational stimulus.
2. Taxis or movements of an animal in response to gravitational forces.
3. A directed response of a motile (moving) organism towards (positive) or away from (negative) the direction of gravity; in other words, a movement of a motile micro-organism or cell in response to the force of gravity.