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Xylem and Phloem Vessel Functions by api-309893409 is a document available to read on EtoBox.
Xylem vessels transport water and mineral ions upwards from roots to leaves and downwards from leaves to storage organs. They have thick cell walls made of cellulose and lignin to prevent collapse. Phloem vessels transport sugars, amino acids, and hormones both upwards and downwards. They are composed of living cells with thin cytoplasm and pores to allow substance transport between cells.
- Author
- api-309893409
- Language
- EN