___helps the cells to grow longer
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hormone auxin
In light, hormone auxin, helps the cells to grow longer in plants . ii. Plant hormone gibberellins helps in growth of a stem.
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These three types of meristem are considered primary meristem because they allow growth in length or height, which is known as primary growth. Secondary meristems allow growth in diameter (secondary growth) in woody plants. Herbaceous plants do not have secondary growth.
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