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photosynthesis in the dark question, please help

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photosynthesis in the dark question, please help

Postby Fa23 » Sun Jan 16, 2011 6:15 am

i did this lab where the rate of oxygen evolution was measured for plants under different lights (red, blue and green) and in the dark...its the experiment with elodea and the fish tank and the syringe and meniscus and stuff, you know the very famous photosynthesis experiment for school.

anyways for red light, the rate of photosynthesis was lower in red light then when the plants were in the dark...what could be the reason for that? might it have something to do with the evolution of the plant and how its better adapted to photosynthesizing in the dark instead of red light because red light does not have enough energy since it has the longest wave length and the lowest frequency or is it for some other reason?

any help would be greatly appreciated. thank you
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Postby JackBean » Sun Jan 16, 2011 9:50 am

I guess it's adaptation to life in water, which filters the long-wave length light.
However, there should be no photosynthesis in the dark.
http://www.biolib.cz/en/main/

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Re: photosynthesis in the dark question, please help

Postby krishnapandu2008 » Sat Feb 26, 2011 1:34 am

:D Dear Fa23

According to your post about the plant photosynthetic in the red light and dark, let me try to give my opinion:
1. The red light was not effective for plant photosynthetic, because the plant had different fitochrome in
its chlorofil, the fitochrome has some duties to select many wave light that possibly received with
the chlorophyl. That means the read light possibly didn't cappable to increased the photosynthetic rate
in your plant sample.
2. What about the dark condition, why the photosynthetic was get increased. As we knows that the
photosynthetic was has to reactions , one is water fotolisis reaction, (the reaction was get point in
to disperse the water compound from H2O became H + 0.5 O2). The second reaction was called
dark reaction, it no need light at all to accomplished the reaction, it really pure as chemical reaction.
The CO2 was capture the H elements and the output was known as C6H12O6 (glucose). So that's
why, the dark condition could increased the photosynthetic rate in plant.
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Postby JackBean » Mon Mar 21, 2011 11:07 am

However, even although the dark park does not directly involve ligth consumption, it requires ligth due to Rubisco activity
http://www.biolib.cz/en/main/

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