Plant adaption for photosynthesis
- Created by: katie
- Created on: 24-03-13 12:11
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- Plant adaption for photosynthesis
- Leaves are flat and have large surface area to absorb maximum light and CO2
- Leaves can grow towards/ orientate with the sun to expose maximum area.
- Leaves thin to allow light to penetrate to lower layers
- Cuticle and epidermis are transparent to allow light to penetrate to mesophyll
- Palisade cells elongated to reduce number of cross walls to absorb light
- Palisade cells packed with chloroplasts to increase photosynthetic capacity/light absorption
- Chloroplasts can move/circulate inside cells to gain best positions for absorbing light
- Spongy mesophyll cells are moist and have large surface area for absorption of gases
- Xylem to supply water and phloem to remove sugar
- Leaves thin to reduce distance for diffusion
- Air spaces in spongy mesophyll allow circulation of gases cut down distance for diffusion into cells
- Stomatal pores permit entry and exit of gases. Intercellular spaces in spongy mesophyll allow gas exchange between outside and inside leaf
- Waxy cuticle on upper surface reduces water loss by evaporation - waterproofs the leaf
- Stomatal pores in lower epidermis reduce water loss by evaporation
- Guard cells can close stomatal pores/control opening to reduce water loss
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