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Xylem
•made of xylem vessels
Xylem vessels are joined end to end to form continuous tube with no end walls
No cytoplasm because they’re dead
Cell walls are thickened with lignin for support. They can be deposited into the walls in different patterns
Amount of lignin increases as plants get older
Minerals and water move in and out of vessels through pits
Phloem
Transports solutes e.g sucrose
Phloem contain sieve tube elements, phloem fibres and companion cells
Sieve tube elements have no nucleus and lack organelles. They’re joined end to end with sieve like end walls
Companion cells carry out living functions for sieve tube elements and them selfs such providing atp for active transport
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