IGCSE Biology glossary
Translocation
Biology editorial review is supported by the named review panel. Reviewer participation may vary by guide. Checked against Cambridge IGCSE Biology 0610 (2026–2028); last reviewed August 2026.
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).
What to include in an exam answer
Say 'sucrose', not 'glucose' or 'sugar'. Sucrose is the transported form and the key term. Pair with xylem for the compare question: xylem carries water and mineral ions upward only; phloem carries sucrose and amino acids in both directions.
Example in context
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.'
Related syllabus topic
Transport in plants