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photorespiration. In a plant cell, the breakdown of a two-carbon compound produced by the Calvin cycle. The Calvin cycle produces the two-carbon compound, instead of its usual three-carbon product G3P, when leaf cells fix O2, instead of CO2. Photorespiration produces no sugar molecules or ATP.
This reaction can be summarised in the word equation: Carbon dioxide + water glucose + oxygen. Photosynthesis - Higher tier. The chemical equation for photosynthesis is: 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2. Glucose from photosynthesis. Glucose is made up of carbon, hydrogen and oxygen atoms. Glucose made by the process of photosynthesis may be used in three ways: 1  It can be converted into chemicals required for growth of plant cells such as cellulose. 2  It can be converted into starch, a storage molecule, that can be converted back to glucose when the plant requires it.