Experiment: Rate of Transpiration in 4 Conditions

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SUMMARY

The experiment on the rate of transpiration was conducted under four conditions: ambient, ambient with a fan, ambient with a lamp, and both a lamp and a fan. The highest transpiration rate was observed in the ambient condition at -0.367, while the combined lamp and fan condition yielded a lower rate of -0.198. The experimental setup involved using a potometer connected to a pressure sensor to measure changes in pressure over a 10-minute data logging period. Suggestions for improvement included testing additional conditions, such as a fan-only and lamp-only setup, and performing background measurements for more comprehensive data analysis.

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  • Understanding of plant physiology and transpiration processes
  • Familiarity with potometer usage and pressure measurement techniques
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Botanists, environmental scientists, and students conducting experiments related to plant physiology and transpiration. This discussion is particularly beneficial for those interested in optimizing experimental design and data analysis in plant studies.

apple963
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I've done an experiment on rate of transpiration in 4 conditions.
1) ambient
2) ambient + fan
3) ambient + lamp
4) lamp + fan

result: the rates are
1) -0.367
2) -0.233
3) -0.197
4) -0.198

why the rate on condition 1 is the highest but not condition 4?
 
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What is your experimental setup, what is the standard deviation on the results, ... You should maybe have taken a fan-only and a lamp-only condition into account as well. Did you perform a background measurement?
 
the set-up of expt:
select a stem with large leaves and insert into a tube under water without bubbles
the other end of the tube is connected to the pressure sensor of potometer
by data logging, the pressure change with time is observed under the 4 conditions. each condition allows 10min data logging.


condition 1: ambient (under ambient laboratory condition)
condition 2: ambient + fan ( position the leaf in a draught from a fan )
condition 3: ambient + lamp (position leaf under the halogen light)
condition 4: lamp + fan ( with both lamp and fan )
 

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