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Home Q & A Board Science-Related Homework Help High School Level Science
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peachesPK peachesPK
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13 years ago
If a plant (spinach) is exposed to light, CO2 increases and oxygen decreases. If it is in darkness, then CO2 decreases and oxygen increases. Is this right or do I have this switched?
-thanks.
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#1
Educator
13 years ago
switch it.
peachesPK Author
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#2
13 years ago
Quote from: bio_man (13 years ago)
switch it.
can you please explain? I thought what when the calvin cycle occurs in the dark, CO2 is reduced ?
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#3
Educator
13 years ago
Oh, well, I just assumed that carbon dioxide, water, and light, via photosynthesis, produces oxygen. In the dark, CO2 increases because there is no sunlight to drive the reaction forward. I didn't think it had to be that detailed. Thinking Face Hmm...

The light-independent Calvin cycle (aka "dark reaction") uses the energy from short-lived electronically-excited carriers to convert carbon dioxide and water into organic compounds that can be used by the organism (and by animals that feed on it).
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