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And the mechanism that's thought to be behind it is brilliantly simple. Cells in the root and shoot tips contain little packets of starch, called statoliths. The starch is dense so the statoliths always settle at the bottom of the cell. The position of the statoliths determines which direction auxin is released in. Tilting the plant on its side makes the statoliths roll and settle on the side of the cells, causing auxin to be released in that direction, and the cells there to elongate.
Auxins are hormones involved in plant-cell elongation, apical dominance, and rooting. A well known natural auxin is indoleacetic acid, or IAA which is produced in the apical meristem of the shoot. Developing seeds produce IAA, which stimulates the development of a fleshy fruit.he auxin causes the cells on the shaded side to elongate more than the cells on the illuminated side. As a result, the shoot bends toward the light and exhibits positive phototropism. In some plant stems, phototropism is not caused by auxin presence or movement.