Photosynthesis

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  • Created by: evie124
  • Created on: 05-04-15 10:11
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  • Structure and adaptations of the leaf
    • large surface area- to collect as much sunlight as possible
    • arrangement of leaves- that minimises overlapping and avoids shadowing
    • thin- most light is absorbed in the first few millimetres of the leaf- short diffusion distance
    • transparent cuticle and epidermis- let light through to the photosynthetic mesophyll cells beneath
    • long narrow upper mesophyll cells packed with chloroplasts- collect sunlight
    • stomata- for gaseous exchange
    • stomata that open and close in response to changes in light intensity
    • air spaces in lower mesophyll layer to allow diffusion of co2 and 02
    • xylem- brings water to the leaves
    • phloem-carries sugars away

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