2ndary structure of stem and roots

[imrandom]

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Hi guys, I'm confused by the concept of the secondary xylem being the actual wood? How does the xylem cells end up being on the outside as wood?

 

[sskater]

As the secondary xylem matures and grows, it pushes outward and causes the secondary phloem to crack and get crushed as it's unable to divide/grow to accommodate the growth of the stem.

 

[imrandom]

Alright thank you!

 

[bigTOOTHguy]

xylem is the wood on the inside, either heart (older secondary xylem, now useless) or sap wood ( secondary xylem still transporting water or xylem sap) .