A plant's response to gravity is called gravitropism, or geotropism; this theory states that the roots are "positively geotropism/gravitropism" - which means that they generally will grow towards the direction of the pull of gravity. The shoot, however, will grow towards light (phototropism).
Plants are able to detect gravity by utilizing their settlements of statoliths, or dense cytoplasmic components that settle under the influence of gravity to the lower portions of the cell. In roots, the statoliths are located in certain cells in the root cap.
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