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Energy Calculations

Energy Calculations. Lecture 2.3 Chapter 3-day 3. 2. Calculate the efficiency of the herbivores and the first carnivores. Why are they different?. 4. Calculate the efficiency photosynthesis. 5.

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Energy Calculations

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  1. Energy Calculations Lecture 2.3 Chapter 3-day 3

  2. 2

  3. Calculate the efficiency of the herbivores and the first carnivores. Why are they different? 4

  4. Calculate the efficiency photosynthesis 5

  5. NPP = GPP -R %Efficiency = (output / input) x 100 % Efficiency of Photosynthesis = (NPP / insolation energy) x 100 102 cm = 1m  In a field of sugar beets in Georgia the net primary productivity is 120 g / m2 /day and the respiration loss is 25%.  The insolation energy is 800 cal / cm2 / day and one gram of sugar beets is equivalent to 2000 calories. A) Find the gross productivity of the sugar beets. B) Using the NPP, calculate the efficiency of photosynthesis for the sugar beets.

  6. Handout: Energy Flow Calculations #4 Use the following information to answer the questions that follow: • The farmer lives on 1 hen/day for a year • 1 hen eats 25 grasshoppers/day • 1,000 grasshopper have a mass of 1.0 kg • 1 grasshopper requires 30g of soy/year • 1 human requires 600 grasshoppers/day • dry soybeans have 3.5 cal/g 1) How many grasshoppers are needed for a year’s supply of hens in order to feed the farmer for a year?

  7. Handout: Energy Flow Calculations #4 Use the following information to answer the questions that follow: • The farmer lives on 1 hen/day for a year • 1 hen eats 25 grasshoppers/day • 1,000 grasshopper have a mass of 1.0 kg • 1 grasshopper requires 30g of soy/year • 1 human requires 600 grasshoppers/day • dry soybeans have 3.5 cal/g 2) How many kilograms of soybeans are needed to feed all the grasshoppers determined in (1) above. Express your answer in kilograms (kg).

  8. Handout: Energy Flow Calculations #4 Use the following information to answer the questions that follow: • The farmer lives on 1 hen/day for a year • 1 hen eats 25 grasshoppers/day • 1,000 grasshopper have a mass of 1.0 kg • 1 grasshopper requires 30g of soy/year • 1 human requires 600 grasshoppers/day • dry soybeans have 3.5 cal/g 3) Estimates from historical records indicate that a person could collect 9 kg of grasshoppers in one hour when they were abundant. Assuming they collected for one hour at peak abundance, and that the farmer chose to eat grasshoppers instead of hens, how many people could the grasshoppers feed compared to the one person that the hen fed?

  9. Handout: Energy Flow Calculations #4 Use the following information to answer the questions that follow: • The farmer lives on 1 hen/day for a year • 1 hen eats 25 grasshoppers/day • 1,000 grasshopper have a mass of 1.0 kg • 1 grasshopper requires 30g of soy/year • 1 human requires 600 grasshoppers/day • dry soybeans have 3.5 cal/g • 4) The farmer needs to consume 3,000 cal/day. If he ate soybeans calculated in (2) above, instead of the hens or the grasshoppers, how many people could his soybean crop feed?

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