The secondary xylem is produced by the cambium. It is placed between the cambium and the medulla. Option B is correct. Secondary xylem.
What is the secondary xylem?
The secondary xylem is the tissue that proceeds from the vascular cambium activity.
Its cells are orientated in different ways composing the vertical/axial system and the horizontal/transversal system.
The secondary xylem is essential to the tree growth in high because of its resistance and the capacity to transport water long distances.
Secondary xylem functions are to transport water and minerals through its vessels and tracheids, to provide support and resistance to the plant, and to store reserve substances.
In the cross-section of the adult tree trunk,
- The outermost layer that interacts with the environment is called periderm (Brown Layer).
- The second layer that follows the periderm is the phloem (Layer C).
- The next layer is the cambium (lateral meristem), which produces phloem cells and xylem cells (Layer B).
- The secondary xylem follows the vascular cambium (Layer A), and
- The medulla is located in the centre of the trunk.
Letter A indicates the secondary xylem.
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