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Slide 2

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Typical leaf
Palisade cells
designed for
· Chloroplasts
· Large surface
area for CO2 to
· Tall so good
change of light
before reaching
cells base…read more

Slide 3

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Leaf features
· Broad- large surface area exposed to sunlight
· Thin- diffusion of gas exchange quicker
· Air spaces- in spongy layer, allow gas exchange, big
internal surface area to volume ratio
· Lots of chloroplasts in palisade layer- nearer to sunlight
· Transparent upper epidermis- allows light through
· Stomata on base-allow gas exchange and transpiration
· Veins-delivery water and nutrients, structure…read more

Slide 4

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Gas diffusion
· Photosynthesis uses CO2 and so there is little
in the leaf meaning a low concentration so
this means the high concentration from
outside diffuses in.
· Same for oxygen and water…read more

Slide 5

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The movement of water molecules across a
partially permeable membrane from high conc.
to low conc.
Partially permeable membrane
Pure water Dilute solution Even at equilibrium
water continues to
move…read more

Slide 6

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Cell shapes
Normal Turgid Flaccid Plasmolysed
Lots of water via osmosis Wilted due to lack of Huge lack of water
Turgor pressure-when the water Cytoplasm shrinks and
cell contents push against Little turgor pressure cell membrane pulls
cell wall and support it away…read more

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