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Edexcel IAL·Biology·IAL Biology

Photosynthesis

17 min read

The light-dependent and light-independent (Calvin cycle) reactions, the role of the chloroplast, and limiting factors.

Photosynthesis converts light energy into chemical energy in glucose: 6CO2+6H2O→C6H12O6+6O26CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_26CO2​+6H2​O→C6​H12​O6​+6O2​. It happens in two stages inside the chloroplast.

The chloroplast

A double membrane encloses the stroma (fluid), within which stacked thylakoid membranes (grana) hold chlorophyll. Thylakoids are the site of the light-dependent reactions; the stroma is the site of the light-independent reactions (Calvin cycle).

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