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Biology Lab Abstract: Photosynthesis

  1. Feb 16, 2008 #1
    [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?
  2. jcsd
  3. Feb 18, 2008 #2


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    How did you set up your lab? Did you use an indicator dye? If so, which one and how does it work (i.e., does it change color if a reaction occurs, and what is that change?)
  4. Feb 18, 2008 #3
    yea, thats it, we used DPIP as an electron acceptor, i didn't even think about it, but it does change from blue to clear as it is reduced...can't believe i missed that, thanks for your help
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