Respuesta :
B. Secondary xylem tissue makes up most of the wood of a tree.
What exactly is secondary xylem?
Secondary xylem is a sort of xylem produced by secondary growth. During initial growth, in contrast, the primary xylem develops. As a result, lateral growth rather than vertical expansion, as in the primary xylem, is connected with the secondary xylem.
The kind of cambium that gives rise to each difference is another point of differentiation. The vascular cambium produces the secondary xylem, while the procambium produces the primary xylem.
Unlike trees and shrubs, non-woody plants lack secondary xylem. It gives such plants mechanical support by depositing lignin into their cell walls, thickening them. The secondary xylem is composed of shorter and wider tracheids and veins than the primary xylem. In comparison to the primary xylem, it is also richer in xylem fibers.
Possible growth rings in the secondary xylem (or annual rings). Sapwood and heartwood are two differentiators of the secondary xylem in big woody plants.
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