Gravitropism 
The growth of plant features towards (roots) gravity or away (stem and leaves) from gravity. This is called positive gravitropism and negative gravitropism respectively. The term Geotropism is also sometimes used.
Gravitropism
The growth of plant features towards (roots) gravity or away (stem and leaves) from gravity. This is called positive gravitropism and negative gravitropism respectively. The term Geotropism is also sometimes used.