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Answer.

Primary growth of plants occurs at tips of shoots and roots in the meristematic tissues of apical meristem, at the apex there is a zone of cell division/mitosis.

Cells elongate at elongation zone, the elongated cells differentiate at the region of differentiation resulting in increase in size.

In the stems meristems give rise to leaf premodia which envelop the apex to form a bud,the bud protects the delicate inner cells.

In roots the meristem is protected by root cap after cells differentiate the form permanent tissues.

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