The graph shows the relationships between air vapor pressure, air temperature, a
ID: 237090 • Letter: T
Question
The graph shows the relationships between air vapor pressure, air temperature, and relative humidity. Relative humidity on the graph is abbreviated ‘hr’ and shown as a proportion, rather than a percentage; a proportion of 1.0 equals 100% relative humidity, a proportion of 0.5 equals 50%.
Consider two identical leaves outside under the two situations in the last question (a typical afternoon in September and in January). Assume that in each situation, the leaf is on a well-watered plant, and that the leaves have identical stomatal (pore) aperture or opening, leaf size, surface absorbance, and that wind speed is the same. Also assume that the air relative humidity is 20% in both situations, and that the temperatures of the leaves are the same as their surrounding air temperatures (40oC in September, 19oC in January). Simply stated, everything mentioned above is the same for these leaves, except the leaf and air temperatures. Concerning the rate of transpiration or water loss from these two leaves, you conclude that:
the rate in Sept would be about ½ the rate in January
the rates would be about equal, based on their similar stomatal apertures
the rate in Sept would be about 1½ times the rate in January
the rate in Sept would be about 2 times the rate in January
the rate in Sept would be over 3 times the rate in January
a.the rate in Sept would be about ½ the rate in January
b.the rates would be about equal, based on their similar stomatal apertures
c.the rate in Sept would be about 1½ times the rate in January
d.the rate in Sept would be about 2 times the rate in January
e.the rate in Sept would be over 3 times the rate in January
Explanation / Answer
B) the rates would be about equal, based on their similar stomatal apertures
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