Biology / Bio 2513 · Atom · ~20 seconds
Primary Growth: Apical Meristem Elongation
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Primary growth lengthens a stem or root through cell division and elongation confined to the apical meristem at each tip.
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A seedling's stem lengthens entirely from new cells added at its growing tip, not from stretching along its existing length.
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Herbaceous plants rely almost entirely on primary growth, showing little to no increase in thickness over their lifetime.