What causes differential growth in stem plant cells? thigmotropy auxins starches elongation

auxins

Explanation:

Auxins are natural plant hormones that act on the plant's cell wall, promoting its distension and, consequently, cell elongation, including plant stem cells. This function promotes the growth of the parts of the plant, causing the elongation of the stem and even the apical dominance that allows the center of the plant's crown to grow more than its sides.

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