change in gibbs free energy

[Katherine Wu 1H]

Choose the one that best describes the change in Gibbs free energy for the process described; briefly justify your answer using a short sentence.
The photosynthesis of glucose inside the chloroplast of an old growth Coastal Redwood tree.
ΔG<0
ΔG=0
ΔG>0
I don't understand why the answer isn't ΔG>0?

[205291012]

I think delta G is probably positive since the process is not spontaneous. You have to input energy in the form of photons for the reaction to take place. Therefore, there isn't free energy available to do work. I'm not sure though.

[Diana Andrade_4F]

Photosynthesis is not spontaneous and needs an input of energy in order for it to occur. So that's why the answer is ΔG<0

[005384106]

How do you know if you have -deltaG or G>0

[005384106]

What does it mean when a reaction is spontaneous?