Recall that several vascular bundles (containing phloem and xylem) are located around the circumference of a vascular plant stem. In contrast, a root contains one vascular bundle running down its center. What might account for this different arrangement of vascular bundles in stems and roots?

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Stems need to be strong enough to support leaves and counteract the force of gravity. The arrangement of multiple vascular bundles around the circumference of the stem helps provide structural support. In contrast, roots do not need to support weight and can rely on a single vascular bundle running down the center to efficiently transport water and nutrients to the rest of the plant.

Recall That Several Vascular Bundles (Containing Phloem and Xylem) Are