measurement of photosynthesis rate +-red filter in elodea

[acherentia]

Hi,

I did a lab today in which I measured the oxygen evolution rate in Elodea in the presence/absence of a red filter.

I would like to know if a lower oxygen evolution in the presence of a red filter as shown by my experiments is the correct way to go for the lab report.

The lab manual also does not specify what a red filter does(it's basically a red plastic). I am assuming that it blocks absorption of all red wavelengths and therefore reduces photosynthetic rate. Can someone please confirm my assumption? I don't even know if Elodea absorbs in the red spectrum but the articles I see online seem to confirm that it does.

We used water with sodium bicarbonate. I am curious what the sodium bicarbonate does to the plants and why it is put in the test tubes. I didn't find a reason for that in my lab manual.

Thank you.

[JackBean]

As you can see here, the chlorophylls have two absorpsion maxima, in the red and blue parts, so if the light has to go through red filter, basically the red light is not available.

The Elodea is whole in water, right? You need some CO2 for the photosynthesis, that's way you have sodium bicarbonate in water

[robsabba]

Hi,

I did a lab today in which I measured the oxygen evolution rate in Elodea in the presence/absence of a red filter.

I would like to know if a lower oxygen evolution in the presence of a red filter as shown by my experiments is the correct way to go for the lab report.

The lab manual also does not specify what a red filter does(it's basically a red plastic). I am assuming that it blocks absorption of all red wavelengths and therefore reduces photosynthetic rate. Can someone please confirm my assumption? I don't even know if Elodea absorbs in the red spectrum but the articles I see online seem to confirm that it does.

We used water with sodium bicarbonate. I am curious what the sodium bicarbonate does to the plants and why it is put in the test tubes. I didn't find a reason for that in my lab manual.

Thank you.

A red filter will allow red light through, which is why we perceive it as red. It would block other wavelengths, such as blue. Photosyntheis has maxima in the blue and red ranges.

[chris123]

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