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This diagram represents a Transverse Section (T.S.) of a dicot leaf. It shows the internal arrangement of tissues that allow the leaf to perform photosynthesis and gas exchange.
Labeled Parts
Number Part Name Function
1 Waxy Cuticle A waterproof layer that reduces water loss through evaporation.
2 Upper Epidermis A single layer of transparent cells that protects the inner tissues while letting light through.
3 Palisade Mesophyll Vertically elongated cells packed with chloroplasts. This is the primary site of photosynthesis.
4 Spongy Mesophyll Irregularly shaped cells with large air spaces to allow for the diffusion of gases (
and
).
5 Xylem Part of the vascular bundle; it transports water and minerals from the roots to the leaf.
6 Phloem Part of the vascular bundle; it transports manufactured food (sucrose) away from the leaf to other parts.
7 Lower Epidermis The bottom protective layer containing the stomatal pores.
8 Guard Cell Specialized cells that control the opening and closing of the stoma to regulate gas exchange and water loss.
9 Stoma (Stomatal Pore) The tiny opening through which carbon dioxide enters and oxygen/water vapor exits the leaf.
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