exchange of materials in plants- B2

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  • Created on: 04-04-13 17:23
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B2 revision guide
Part of plant Use and adaptation
Waxy cuticle Waterproof layer which prevents water loss
Palisade mesophyll cells Top of the leaf, full of chloroplasts to capture as
much light energy as possible. They have a long
shape which leaves a large surface are on the
side to take in CO2
Air spaces Allow CO2 to get to cells & oxygen to leave
Spongy mesophyll cells Large surface area available for gas exchange
Guard cells These cells open and close stomata to control
water loss (when plant has lots of water the
grad cells become plump & turgid. when the
plant is short on water, the guard cells close and
become flaccid, making the stomata close.)
stomata Allow gases to move in and out of the leaf
vein Bring plenty of water to the cell of leaves
Cellulose for cell wall Respiration for energy

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B2 revision guide
Oil& starch Glucose protein for growth
Transpiration: the loss of water vapour through stomata of a leaf. The waxy cuticle helps to prevent
water loss under normal conditions. Transpiration is quickest in hot, dry, windy conditions.
Transpiration is needed to draw up more water from the roots to react with CO2 to form glucose &
oxygen by photosynthesis.…read more


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