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Question
We know that if we increasing the amount of carbon dioxide is good for photosynthesis, but if the concentration of Carbon dioxide is very high, it 's decrease and maybe cancel the rate of photosynthesis, why ?

Answer
Hi there, thanks for your question.

I'm not sure exactly what you're asking, but remember that plant metabolism is always a balance between photosynthesis and respiration.  Yes, the Calvin cycle takes CO2 from the atmosphere and fixes it into sugars, but balance that with respiration, in which CO2 is produced.

So a high concentration of CO2 may be beneficial to photosynthesis, but without an electron acceptor (oxygen), aerobic respiration can be compromised.

I hope this answer has helped you.  Please write back if you have more questions.

FM Rollwagen, PhD

Biology

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Florence M Rollwagen

Expertise

I can answer questions in biology, microbiology and immunology on the undergraduate or graduate level. I can also address medical and health concerns regarding alternative medicine, autoimmune diseases (lupus, MS) liver disease and intestinal problems.

Experience

I have over 20 years experience in research and teaching at the medical/graduate level, and 5 years teaching college biology and microbiology. My expertise is in microbiology and immunology, specifically the biology of cytokines and soluble immune response modifiers. I also carried out original research in blood substitutes and shock/trauma.

Organizations
American Association of Immunologists (AAI) American Association for the Advancement of Science (AAAS)

Publications
Journal of Experimental Medicine, Journal of Immunology, Cytokine, Shock, Experimental Hematology

Education/Credentials
BS biology 1966 MS biology 1968 PhD immunology 1979

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