CO2 use by marine plants

From: Cathy Schaeff (
Date: Tue Feb 25 2003 - 16:23:58 EST

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    Hi Celeste,

    I am guessing from the way you stated your question that you know about
    photosynthesis and that plants use CO2 to produce organic carbon and O2.
    First, make sure that everything was the same for the three experiments --
    little things like temperature and distance from a window or other light
    source could make a big difference. Photosynthesis is a chemical reaction --
    think about what else is needed for the reaction and what other factors
    might influence the speed and extent of the reaction.

    Let me know how you do.

    Cathy Schaeff
    ----- Original Message -----
    From: <>
    To: <>; <>
    Sent: Friday, February 21, 2003 12:46 PM
    Subject: Ask a scientist question

    > Hi! I have a question.
    > Does the amount of CO2 in a body of water have an effect on the amount
    > oxygen Elodea (a marine plant like protist) produces? I have collected
    > on this topic for abou 12 days, and what happened is quite strange. The
    > Elodea in pure water produced the smallest amount of oxygen, but the
    > placed in the highest concentration (4tsp. baking soda) of carbon dioxide,
    > did not produce the most! The middle plant...the one placed in 2 tsp.
    > soda solution produced the most oxygen. Why is this??? Im really
    > If you could help me I would greatly appreciate it.
    > Thanks,
    > Celeste
    > Middle sChool Student

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