Biology B4


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Broad- Large surface exposed to light.

Thin- CO2 and water vapour only have a short distance to travel to reach phtosynthesising cells.

Air spaces- Located in the spongy mesophyll layer. Gases can move easily between cells. "Large surface area to volume ratio"

Chlorophyll- Found in chloroplasts. Absorbs light energy for photosynthesis.

Transparent Upper Epidermis- Light can pass into the palisade layer.

Stomata- Small holes on the lower surface. Let gases through, Let water out (transpiration)

Network of veins- Deliver water and nutrients to all parts. Take away food produced by the leaf.

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