1. Human agriculture is one of the biggest users of fresh water on our planet to
ID: 296035 • Letter: 1
Question
1. Human agriculture is one of the biggest users of fresh water on our planet today. If you wanted to minimize the use of water on a farm field, how could you make a crude calculation of the amount of water yo use ( the irrigation rate)?
A. Calculate the PET for the day and irrigate with exactly that much water.
B. Calculate the PET for the day, subtract recent rainfall, and irrigate with the difference between those.
C. Measure the temperature, multiply by 2, and irrigate with exactly that much water (in mm).
D. Figure out the specific PET for your crop and irrigate with exactly that much water.
2. A species' physiological tolerances determines which of the following?
A. All of the places it can perform its basic functions and therefore where it can potentially live.
B. All of the places it can perform its basic functions and therefore where it will be found.
C. The places where its performance is optimized and therefore where it can potentially live.
D. The places where its performance is optimized and therefore where it will be found.
Explanation / Answer
1. B. Calculate the PET( Potential Evapotranspiration) for the day, subtract recent rainfall and irrigate with the difference between them
PEt estimates the amount of transpiration that will occur in a day i.e. total water loss that will occur ultimately the water that will be required at the end of the day. But recent rainfall may substitute for some of the irrrigation demand so we subtract it from the PET values and irrigate with the difference.
2. A. all of the places where it can perform its basic functions and therefore where it can potentially live.
Physiological tolerance means how much environmental variation can an organism tolerate, where it may not thrive but will be able to survive by performing basic functions. It may not be present in all the environment but has a potential of being found.
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