What is the meaning of reduction here?

Dear Student,

​​​​​​Here, Reduction means addition of hydrogen with Carbon dioxide. Refer the following reaction
 
6CO2 + 12H2O ---> C6H12O6 + 3O2
 
This occurs during dark reaction phase of photosynthesis. Here, Hydrogen is added to carbon dioxide due to which it is said to be reduced.

Regards.

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Reduction refers to the addition of hydrogen in this case. Refer the following reaction

6CO2 + 12H2O ---> C6H12O6 + 3O2

This reaction takes place during the dark reaction phase of photosynthesis. Here, Hydrogen is added to carbon dioxide due to which it is said to be reduced.
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