Translocation
Exam-ready definition
The movement of sucrose and amino acids in the phloem, from regions of production (sources, e.g. leaves) to regions of storage or use (sinks, e.g. roots and fruits).
How this is marked
Say 'sucrose', not 'glucose' or 'sugar'. Sucrose is the transported form and the paying word. Pair with xylem for the compare question: xylem carries water and mineral ions upward only; phloem carries sucrose and amino acids in both directions.
In an exam answer
Distinguishing it from xylem transport: 'Sucrose is moved by translocation in the phloem, from the leaves (source) to the roots and fruits (sinks), in both directions.'
Full topic guide: Plant nutrition
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