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wWe looked
at the concepts of pH and the buffer capacity in living systems.
Two Students are
running pH trials on biological and non-biological materials. By comparing
change in pH values students determine that a corellation exists between
the complexity of the molecule and the ability to buffer.
Evaopotranspiration
We explored the
relationships of surface area and environmental factors on plant transpiration.
The plant used in our tests was Photinia X Fraseri (Red-tipped Photinia)
The initial "control"
treatment was run under typical laboratory environmental conditions.
This group varied
light intensity as an experimental treatment.
Total Leaf Area was
determined by weighing a 4cm x 4cm (16cm2) square of leaf tissue and then
dividing this into the mass of the leaves used in the transpiration trials.
Transpiration rate was determined by plotting the change in pressure over
time. (atm/sec/cm2) A comparison is then made between the various
experimental treatments and the control.
This data was
taken from the heat experimental trial shown below. The slope(M) (rate)
of transpiration was found to be - 1.75 x E-04 atm/s
A portable heater
was used as an independent variable in this groups trial.
This group varied
the relative humidity as an experimental treatment. |
