palisade leaf cells
- Packed with chloroplasts for photosynthesis.
- thin:so more can packed at the top of leaf to absorb light
- tall: bigger surface area for absorbing CO2
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- kidney shape for opening and closing the stomata
- if the plant has lots of water guard cells will be turgid and open up the stomata for gas exchange for photosynthesis
- when the plant has little watter guard cells close and become flaccid so that water isnt lost
- thin outer walls and thickened inner walls make the opening and closing work.
- sensitive to light: at night guard cells will close to save water without losing out on photosynthesis
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red blood cells
- concave: larger surface area for carrying oxygen and easily passes through capillaries
- haemoglobin: to absorb the oxygen
- no nucleus: leaving more space for haemoglobin
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sperm and egg cells
- nourish embryos and give DNA
- carries food reserves to feed embryos
- changes shape once fused with a sperm to stop more sperm getting in.
- streamlined head and tail for swimming
- male DNA
- enxymes in its head help digest through the eggs cell membrane.
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