Question

Why do green plants need sunlight to perform photosynthesis?

Answer 1

Is not the photosynthesis reaction strongly endothermic....?

Explanation:

When hydrocarbons combust the products are carbon dioxide and water. These are stable molecules that possess STRONG `C=O` and `H_2O` bonds.

Plants fix atmospheric carbon dioxide, and with water can use photosynthesis to make simple sugars.....

`6CO_2(g) + 6H_2O(l) +DeltararrC_6H_12O_6(aq) +6O_2(g)`

As written, the reaction is highly endothermic; much energy has to be expended to break the `O-H` and `C=O` bonds. From where does the energy come? Does photosynthesis occur at night?