The light energy captured during photosynthesis is stored as water.
sugar.
carbon dioxide.
electrons.

Sugar

Explanation:

This is because water and carbon dioxide are required during photosynthesis. Oxygen along with glucose, that is a type of sugar is produced. The oxygen is diffused out in to the air, while the sugars are stored in the leaf thus light energy captured during photosynthesis is stored as 'sugar'

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