Question

Why is photosynthesis an endothermic reaction?

Answer 1

Photosynthesis is an example of an endothermic chemical reaction. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen. This reaction requires 15MJ of energy (sunlight) for every kilogram of glucose that is produced.

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Answer 2

Photosynthesis is an endothermic reaction because it requires energy supply (in the form of photons)

Step-by-step explanation:

Photosynthesis is the process by which plants generates carbohidrates and oxigen, from carbon dioxide and water.

6CO2 + 6H2O ⇒ C6H12O6 + 6O2

The first step of photosynthesis requires energy supply in the form of a photons that are captured by pigments (chlorophyll for example), exciting electrons and this way allowing the occurence of following steps.