Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Biology - Photosyntheis Exp. question

  • 23-05-2006 05:38PM
    #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)


Comments

  • #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!


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


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


  • #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)


  • #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.


Advertisement