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Biology - Photosyntheis Exp. question

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  • 23-05-2006 6:38pm
    #1
    curtains
    Closed Accounts Posts: 127 ✭✭


    Hey... can anyone help me here?

    You know the experiment to investigate the effect of light intensity on photosynthesis... how do you go about drawing the graph for that?

    I know rate of photosynthesis (as in bubbles evolved) goes on the y-axis, but as for the x axis, if you put it in terms of distance from the lamp to the apparatus won't that give you a graph the wrong way round? (ie you have to start on the left with 100cm)


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    #2
    Raphael
    Closed Accounts Posts: 8,880 ✭✭✭Raphael


    You use the actual light intensity. As in, stick a light meter in front of the water bath. Or just say you did. Hope that helps!


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    #3
    europerson
    Registered Users Posts: 2,909 ✭✭✭europerson


    Light intensity is given by 1/(d^2), where d is the distance from the luminaire to the plant.


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    #4
    smiling_time
    Closed Accounts Posts: 81 ✭✭smiling_time


    If you used a light meter to measure the light intensity you can use those readings on the X axis. However if you simply kept the lamp at specific distances from the plant then you must use the formula LIGHT INTENSITY = 1/D2 (SQUARED)


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    #5
    shane0312
    Closed Accounts Posts: 190 ✭✭shane0312


    Its better if you use 10000/(D)squared because its in centimetres and then you get better values for the light intensity.


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