Determine the surface area of all the leaves on each of your
plant cuttings by:
Cut all the leaves (not stems) off of your plant and weigh
them with a balance.
Estimate the total leaf surface area in (cm2) for your plant
by cutting out a section of leaf 5 cm X 5 cm.
Weigh this leaf section and divide by 25 to find the weight
of l cm2 of leaf.
Divide the total weight of the leaves by the weight of l cm2
to find the total leaf surface area.
Record this value in Table 1.
Calculate the rate of transpiration / surface area. To do
this, divide the rate of transpiration by the surface area for
each plant. These rate values can be expressed as atm/min/cm2.
Record this value in Table 1.
Obtain the data for each variable you did not test from other
members of your class. Average the results of similar tests and
record these rates in the second column of Table 2.
Using the values from the second column of Table 2, subtract
the control rate/area value from each experimental value. Record
these adjusted rate results in the third column of Table 2.
Make a bar graph that illustrates the relative effect of different
environmental variables on the transpiration of water in plant
cuttings. Plot the adjusted rate on the y axis and the nature
of the test on the x axis.
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