Biology Unit 4

Outline of photosynthesis

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Biology Unit 4
Revision Notes
Topic 5: On the wild side
3. Describe the overall reaction of
photosynthesis as requiring energy from light to
split apart the strong bonds in water molecules,
storing the hydrogen in a fuel (glucose) by
combining it with carbon dioxide and releasing
oxygen into the atmosphere.
Photosynthesis: the fixation of carbon dioxide and its reduction using hydrogen from water. The
process by which energy is captured from the sun using chlorophyll and converts CO2 and H2O into
simple sugars.
General Equation:
6CO2 + 6H2O ---> C6H12O + 6O2
Photosynthesis is a process found in plant cells which converts light energy into chemical energy in
the form of sugars that the plant can store and use at any time. Photosynthesis takes place in
the chloroplasts, an organelle only found in plant cells, and consists of two parts:
the light dependent reaction, which converts light energy into ATP,
Calvin cycle, which converts ATP into glucose.
Photolysis: Photosynthesis uses energy from light to split water into hydrogen and oxygen
The hydrogen which is released is combined with CO2 to form glucose. O2 is released into the
atmosphere as a waste produce of this process.
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Text Book: p.12


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