Question

What happens with primary xylem during secondary growth

Answer 1

Answer:

During the fall season, the secondary xylem develops thickened cell walls, forming late wood, or autumn wood, which is denser than early wood. This alternation of early and late wood is due largely to a seasonal decrease in the number of vessel elements and a seasonal increase in the number of tracheids.

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Answer 2

Answer:

The activity of the vascular cambium gives rise to annual growth rings.During the spring the growing season,cells of the secondary xylem have large internal diameter,their primary cell walls are not extensively thickened.This is known as spring wood.

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