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GCSE Combined Science · key term
A living, elongated phloem cell joined end to end with others to form a transport tube; it has little cytoplasm and no nucleus.
Used by OCR
Specification B2.2h · Biology Paper 1
Revise: Xylem and Phloem AdaptationsPhloem tubes are made from living cells called sieve-tube elements, joined end to end. Unlike xylem vessels, they retain their end walls. These walls contain holes and are called sieve plates.
Biology, Combined Science
A living cell joined to others to form a phloem tube, with perforated end walls that allow dissolved substances to pass through.
A sieve-tube element is living despite having no nucleus. Do not confuse it with a dead xylem vessel cell.
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Phloem tubes consist of living cells called sieve-tube elements, joined end to end. Unlike xylem vessels, they retain end walls. These walls have holes and are called sieve plates.
