[SOLVED] Biology Lab Abstract: Photosynthesis 1. The problem statement, all variables and given/known data I am having trouble understanding how increased transmission is an indication to photosynthesis occurring. My teacher gave us the prediction for this lab: if photosynthesis is happening then transmittance goes up. I know transmittance is light that passes through a substance, and the transmitted light was converted to electrical energy in our experiment so that we could measure it. The data showed that the Chloroplasts with light shining on them had a higher transmittance %. 3. The attempt at a solution My idea is that a higher % transmittance means that more of the light detected by the machine is transmittance, which would mean that more light is being absorbed for photosynthesis. A lower % transmittance means less light is absorbed because less of the light is transmitted light? This whole thought process is confusing me. My issue, I guess, is: shouldn't all the light detected by the machine be transmitted light?