How Surface Area Affects the Rate of Transpiration of Leaves

How Surface Area Affects the Rate of Transpiration of Leaves

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How Surface Area Affects the Rate of Transpiration of Leaves


To show that transpiration did occur on a leaf we did a preliminary
experiment. We took two plants, and set them in a bell jar, one of the
plants was cut beneath its leaves, so that we could show that if it
did transpire it would be from the leaves and not the stem. The
experiment was set up like this:

Water appeared on the side of the bell jar, this shows that
transpiration does occur through the leaves of a plant.

For the method we are going to use to see if surface area affects the
size of a leaf we are going make sure that we keep the leaves in the
same conditions at all time, because light, wind or temperature might
affect it. So we are keeping the leaves away from the window and we
also will shut the windows, but we can't do much about that so we will
presume that the temperature will be kept constant. I think that our
results will show that surface area will not make any difference to
the amount perspired, even if a bigger leaf might have more
chlorophyll. I think that this will happen because I think that the
even if one leaf perspires faster in the end they would have perspired
the same amount.

I took 3 leaves of different shapes and took down their mass; we took
their mass on a weighing scale of two decimal points as it is more
accurate. We then hanged them up on a threat with a peg. The thread
was hold up by two stands and we let them be for 20 minutes. After 20
minutes we took the 3 leaves down and took down their mass again. We
did this 3 times, so we have 3 readings. All the way through we made
sure that the leaves were held at a distance so that if they did
touched it might have affected our readings. We only could do 3
readings as we only had a double lesson to do this experiment and if

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we weren't in the lesson we couldn't have controlled the experiment.

This is a diagram to show how our equipment was set up:

[IMAGE]

This is a table to show my results:

Mass of leaf in grams (g)

Surface Area of Leaf (in cm²)

Mass of the leaf at the beginning (0min)

Mass of leaf after 20 min

Mass of leaf after 40 min

Total mass lost

Leaf 1

56 ½

1.96

1.91

1.90

0.06

Leaf 2

33 ½

1.18

1.16

1.14

0.04

Leaf 3

22 ½

0.89

0.86

0.86

0.03

We only did one reading as we couldn't repeat this experiment as it is
impossible to have the same leaf with the same amount of surface area,
and the conditions would have to be the same.
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