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Transpiration rate using potometer

Asked by notorius_king | Apr 21, 2004 | AS Level > Biology > Advice
notorius_king
which variables must be kept the same throught out an experiment (apart from surface area)

SZPoints: 12 | Difficulty: Very Hard | Comments: 3 | Unanswered

3 Comments

notorius_king, 21 Apr, 2004 @ 21:48
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hello

N, 22 Apr, 2004 @ 10:39
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N
send txt message to N pinkstar (58) N's blog
You only need to adjust the factor that you are investigating. So for example if you are investigation the affect of temperature on the rate of tranpiration you only need to change the temperature what DEFINATLY NEEDS to be kept constant is Surface area Species of plant (if you use different species then it will bias your results) Time Wind conditions Humidity Light intensity (the amount of light hitting the plant) Carbon dioxide consentration

Also if you are going to evaluate the experiment you could say "it would be ideal to count the number of stomata on the leaf, however this was not possible using the equiptment that I had" I'm currently revising for my A2's and Biology is one of them, so I have done this experiment before!

Hope this helps you!

shopgirl, 22 Apr, 2004 @ 14:58
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shopgirl
send txt message to shopgirl deepskybluestar (24) shopgirl's blog
A potometer is used to measure relative rate of transpiration, by measuring the rate of movement of an air bubble along a tube of water. You then set several conditions – light/dark, still air/breeze (using a hair dryer) and warm/cool breeze (again using a hairdryer). You could add plant hormones and see if these have any effect. hope this helps

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