Which molecule is the source of basic material used for the production of glucose in the calvin cycle?

Carbon dioxide

Explanation:

In a calvin cycle , glucose is  produced mainly because of carbon dioxide. Generally in the light dependent phase of photosynthesis, carbon dioxide react with water in the presence of light and chlorophyll pigment to produce glucose as shown in the reaction below-

6CO2 + 6H2O → C6H12O6+ 6O2

This process of photosynthesis is also referred as carbon fixation as the inorganic carbon gets converted into high-energy organic molecules like glucose

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