The older inner xylem that no longer conducts water is known as?

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Multiple Choice

The older inner xylem that no longer conducts water is known as?

Explanation:
As trees age, xylem forms two zones: the outer sapwood, which still conducts water, and the inner heartwood, which no longer conducts water. Heartwood becomes filled with deposits like resins and tannins and loses its water-transport capability, but it strengthens the stem and helps resist decay. Cambium is the growing layer that produces new xylem and phloem, while phloem transports sugars rather than water. So the older inner xylem that stops conducting water is heartwood.

As trees age, xylem forms two zones: the outer sapwood, which still conducts water, and the inner heartwood, which no longer conducts water. Heartwood becomes filled with deposits like resins and tannins and loses its water-transport capability, but it strengthens the stem and helps resist decay. Cambium is the growing layer that produces new xylem and phloem, while phloem transports sugars rather than water. So the older inner xylem that stops conducting water is heartwood.

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