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plant is supplied with normal carbon dioxide but water

Sent to General Experts December 22, 2005 2:13 p.m.

Plant 1 is supplied with normal carbon dioxide but water that contains radiactive oxygen atoms. Plant 11 is supplied with normal water but carbon dioxide that contains radioactive oxygen atoms. Each plant is allowed to perform photosynthesis and the oxygen gas and sugars produced are tested for raioactivity. Which plant would produce radioactive oxygen gas? Why?

Customer (name blocked for privacy)

Status: Closed Value: $7

Answer
December 22, 2005 2:22 p.m. (8 minutes and 32 seconds later)

ACCEPTED

With respect to oxygen and photosynthesis: Oxygen is a product of the photolysis reaction not the fixation of carbon dioxide during the light-independent reactions. Consequently, the source of oxygen during photosynthesis is water, NOT carbon dioxide.

6 CO₂ + 12 H₂O + light energy ----> C₆H₁₂O₆ + 6 O₂ + 6 H₂O

So in answer to your question, Plant 1 will produce radioactive oxygen gas.

More here: http://en.wikipedia.org/wiki/Photosynthesis#Plant_photosynthesis

I hope that helps you out. Unless you need additional info, please click ACCEPT to close our question/answer session. Bonuses are great and feedback would be appreciated too. I'll leave some for you. Thanks

Edited by Steve555 on December 22 2005 at 2:23pm

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Thanks very much and good luck.

Steve Gardner -- Electrical Engineer -- 100% Positive Feedback on 63 General Accepts
Computer geek, mechanic, tutor and musician.

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