Biology a level students

How is the structure of the xylem and phloem related to function

Xylem is made of cells which are dead so do not contain a cytoplasm and instead have lignin in order to strengthen them as another function of xylem is support. Phloem is primarily for transport only not support so the cells are living and are called sieve tube elements, they don't need to be as rigid. They do not contain nuclei or many organelles so each one has a companion cell attached which carries out the primary living functions for itself and the sieve tube element.

That's all I can remember, revised this two days ago but forgotten so much 😩

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