WJEC GCSE Biology 2 Photosynthesis

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  • Created by: Meg
  • Created on: 22-05-12 16:50
Preview of WJEC GCSE Biology 2 Photosynthesis

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Megan Nolan
Biology Revision notes:
Water + Carbon Dioxide Sugar + Oxygen
6H2O + 6CO2 C6H12O6 +6CO2
Leaf adaptions:
Thin and flat to trap more light
Transparent upper layers to let light through palisade layer
Palisade layer contains lots of chloroplasts to trap light
Arrangement of palisade cells to increase efficiency
Leaves can turn to face the light
Veins bring in water for photosynthesis
Stomata allow entry of Carbon dioxide
Uses of sugar made in photosynthesis:
Carried over the plant in phloem tubes as sugar is soluble; this is called translocation.
Amino acids- needed for growth and made from Carbon, Oxygen, Hydrogen and Nitrogen
COH from glucose (N from soil)
Energy- Carried to all cells for respiration
Starch- Found in leaves, seeds and roots
Cellulose cell wall- Cellulose made out of glucose
Lipids- Found in seeds where they provide energy for growth
Sucrose- Found in fruits; to attract animals for dispersal of seeds. Also found in nectar in
flowers; to attract insects to pollinate.
Limiting Factors:
Light, Carbon dioxide, heat and water are all factors needed for photosynthesis, if one is in short
supply, the rate of photosynthesis will stop increasing and a graph will Plato.
CO2 is the most common limiting
factor as there is only 0.04% carbon
dioxide in the atmosphere.
On this diagram, light can't be the
limiting factor (from the point where
the green line bends onwards) as it's
the thing being increased . The red
line represents when CO2 is the
limiting factor as light and heat are
present. The blue line could represent water as the limiting factor, or it could simply mean that the
enzymes simply cannot work any harder.


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