During photosynthesis, plants use light energy to synthesize glucose from carbon dioxide. However, plants do not use up energy during photosynthesis; they merely convert it from light energy to chemical energy. This process is an illustration of

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The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another. During photosynthesis, light energy is converted to chemical energy, which is a clear example of the first law of thermodynamics.

During Photosynthesis, Plants Use Light Energy to Synthesize Glucose from Carbon