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GCSE Biology · key term
A perforated end wall between phloem sieve-tube cells through which dissolved sugars can pass.
Used by AQA, Edexcel and OCR
Specification 4.1.1.3 · Paper 1
Revise: Cell SpecialisationPhloem transports dissolved sugars made by photosynthesis to parts of the plant that need or store them. Its living sieve-tube cells are joined end to end. Their end walls, called sieve plates, have pores through which the sugar solution can pass.
Specification 6.8 · Paper 2
A perforated end wall between phloem sieve-tube cells that allows dissolved substances to pass through.
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Phloem contains living sieve-tube cells joined end to end. Their end walls, called sieve plates, have holes through which dissolved sucrose can pass. Sieve-tube cells have few internal structures, leaving more room for the solution to flow.
Specification B2.2h · Paper 1 (Foundation), Paper 3 (Higher)
A perforated end wall between neighbouring sieve tube elements through which phloem sap can pass.
Revise: Xylem and phloemUnlike mature xylem vessel elements, they remain alive. Their end walls are not completely removed: they become sieve plates, containing many pores through which dissolved sugars and amino acids can pass from one element to the next.