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Paper 4Theory (Extended)2 marks
Understanding source and sink roles in plants
Description
Source and Sink Roles in Plant Parts
A young leaf is growing and cannot photosynthesize enough sugars. A mature leaf is fully photosynthetic. A tuber stores sugars during the growing season and releases sugars during sprouting.
- a[2]
Explain why a young leaf acts as a sink while a mature leaf acts as a source.
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