Suppose a plant is receiving 150 units of heat per minute due to solar radiation

Question

Suppose a plant is receiving 150 units of heat per minute due to solar radiation, and 45 units of heat per minute due to infrared radiation, but 60 units per minutes solar radiation are reflected back by the leaves, and it emits 30 units of infrared radiation. It also loses 50 units of heat per minute through evapotranspiration. The temperature of this plant is not changing. Based on this, we can conclude that the combination of conduction and convection is resulting in___________ of heat to/from the plant. And that it's temperature is currently __________ the ambient temperature.  

A. a net input; warmer than

B. a net input: colder than

C. a net output: warmer than

D. A net output: colder than

E. A zero net change: the same as

Explanation / Answer

The temperature of this plant is not changing. Based on this, we can conclude that the combination of conduction and convection is resulting in a net output of heat to/from the plant. And that it's temperature is currently warmer than the ambient temperature.  

?H(plant) = SR + IR(in) - IR(out) ± H(conv) ± H(cond) - H(et) / ?H(plant) = 150 + 45 - 60 -30 - 50 = 55

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