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Leaves are the primary organs of photosynthesis in a plant. Their structure is beautifully adapted to maximise the rate of photosynthesis while minimising water loss. This lesson covers the detailed structure of a leaf in cross-section and explains how each part is adapted for its function, as required by Edexcel GCSE Biology (1BI0) Topic 6.
When you look at a leaf under a microscope (in cross-section), you can see several distinct layers. From the top to the bottom, these are:
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