CAIE IGCSE Biology 8.4.3 Changing Sources & Sinks
Practise explaining why a leaf, root or storage organ can switch between source and sink roles over time.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- identify a growing or filling organ as a sink because it receives and uses or stores assimilates
- identify a photosynthesising leaf or mobilised storage organ as a source because it releases assimilates
- explain a seasonal reversal by tracing sucrose from reserves to shoots and later from leaves to storage
8.4.3—Some parts of a plant may act question 1
[Maximum number: 2]
Explain why some parts of a plant can act as both a source and a sink.
(acts as a ) source when it is (moving sucrose from) a region of production / photosynthesising ;
(acts as a ) sink when it is, growing / storing / respiring / a region of utilisation ;
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