The graph shows the relationships between air vapor pressure, air temperature, a
ID: 237089 • 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%.
Compare the water loss rates from a lizard here in the desert during a typical early summer day and night. Assume that the aperture of the pores and any other openings (that allow water vapor loss) on the lizard’s surface are similar day and night. Also assume that the air vapor pressure is similar day and night (a reasonable assumption unless a storm system happens to come through). The temperature during the day is many degrees higher than at night. Assume the lizard's surface temperature is the same as its surrounding air temperature. The rate of water loss from the lizard would be much lower at night because the VPD is lower at night. Why is the VPD lower at night?
lower nighttime air temperature would mean lower air vapor pressures, which would lower the lizard-to-air VPD
lower nighttime lizard surface temperatures mean lower saturation vapor pressure, which means a lower lizard-to-air VPD
the relative humidity would be higher at night than during the day
a.lower nighttime air temperature would mean lower air vapor pressures, which would lower the lizard-to-air VPD
b.lower nighttime lizard surface temperatures mean lower saturation vapor pressure, which means a lower lizard-to-air VPD
c.the relative humidity would be higher at night than during the day
Explanation / Answer
Option A: During the night time air temperature is lower and the vapour pressure is also lower, which would lower the lizard to air VPD.
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