Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic? (2 points)

Photosynthesis is a chemical reaction in which carbon dioxide (CO₂)and water (H₂O) are converted into glucose (C₆H₁₂O₆) and oxygen (O₂ ) with the help of chlorophyll and enzyme RuBisCO.

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

It is classified as an endothermic reaction as it requires the input of energy in the form of solar energy.

In the light reaction of photosynthesis, solar energy is used for the photolysis of water which releases free electrons and oxygen. It leads to the production of ATP and NADPH.

In the dark reaction of photosynthesis, ATP and NADPH are used to fix carbon obtained from carbon dioxide into glucose or sugar with the help of enzyme RuBisCO.

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