Auxin and Gibberellins are hormones found in plants that help them to grow longer on the dark side. Thus, the statement is true.
Auxin hormone is used for the expansion of cells of the plant more on the darker rather than lighter side. It helps in the development of chloroplast in the leaves to keep them green and fresh.
It helps in the absorption of nutrients in the leaves and stop them from fading. It also helps in the regeneration of cells along with the production of fruit in them like pineapple.
Therefore, it is true that both plant hormones help to grow the cell of the plant.
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