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Biology Revision Notes
Module 4.
OCR Gateway Science
Zaynab Khan…read more

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· Chlorophyll- traps light.
Large surface area of leaf aids trapping of
· Veins- provide structural support to the leaf &
transports water to leaf.…read more

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The leaf is thin to aid diffusion of gasses in
and out the leaf.
The stomata allows the exchange of gases.
CO2 diffuses in through the stomata
O2 diffuses out of the stomata.…read more

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The palisade layer, near the top of the leaf, is
packed with chloroplast to absorb sunlight.
The spongy mesophyll layer has lots of air
spaces to allow exchange of gases.
ROOTS!…read more

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Balanced photosynthesis
Light energy
6CO2 + 6H2O C6H12O6 + 6O2…read more

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