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Moderate

Humidity and Transpiration

APBIO-4XGV1V

Transpiration is the evaporation of water from open stomata in plant leaves. A group of AP Biology students used a gas pressure sensor in an experiment measuring transpiration. In an experiment testing the effect of humidity on the rate of transpiration, the following data was obtained.

Experimental Group Adjusted Rate $(k/Pa/min/cm^{2})$
A 0.1
B 1.5
C 5
D 17.2
E 25.3

$\ $
Identify the group that was in the highest humidity condition.

A

Experimental Group A, since the adjusted rate shows minimal change in transpiration.

B

Experimental Group B, since this shows that some transpiration occurred, but at a low rate.

C

Experimental Group C, as the adjusted rate of water loss indicates an intermediate amount of transpiration.

D

Experimental Group E, since the highest rates of transpiration will occur with the greatest amount of evaporation.