Are chlorplasts necessary for the reduction of DCPIP? why or why not?

Question

and is light necessary for the reduction of DCPIP? why or why not?

I

Answer 1

We did a lab with a spectrometer and we had curvettes with chloroplasts, phosphate buffer,water a DCPIP. And a light was shone through. Then we got the data for light absorbed. What does that mean? Like the higher the percentage of light absorbed, the more the DCPIP got reduced?

Answer 2

I think what we did was called the Hill Reaction