Gibberellins are defined as a class of plant hormones that stimulate growth stem and leaves, trigger the germination of the seed and breaking of bud dormancy, and stimulate fruit development with auxins.
When a seed grows the shoot grows upwards and the roots grow downwards. In the roots auxins cause cells to stop elongating and this causes positive geotropism. Therefore, the roots will grow in the direction of gravity. This helps to anchor the plant in place and helps the plant to collect water and nutrients.
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