Question

5. Imagine a scenario where there are 2000 units of energy available at the primary producer level. The consumption efficiency to the herbivore level was 50% and the assimilation efficiency of the herbivores was 40%. If the production efficiency at the herbivore level was 20%, what is the trophic efficiency between these two trophic levels (in %)? 6. The graph shows how evapo-transpiration influences NPP. The NPP units are gram per m²/yr. What is the NPP at 30 cm evapo-transpiration in metric tons/ha/yr? Note: you need to calculate logarithms and do two metric conversions to get the right result Evapotranspiration is a general measure of energy flow into the system- water being evaporated and transpired by plants. As evapotranspiration increases, generally, there is more productivity in the ecosystem Aboveground productivity (log?? g/m²) 3.50 3.25 3.00 2.75 2.50 2.25 2.00 1.75 1.50 Tropical forest Hemlock-beech forest Beech-maple forest Pine forests Chestnut-oak heath Pine heath Tallgrass prairie Alpine tundra Arctic tundra Creosote-bush desert 2.00 2.25 2.50 2.75 3.00 3.25 Estimated actual evapotranspiration (log?? mm/yr)

          5.
Imagine a scenario where there are 2000 units of energy available at the primary producer level. The consumption efficiency to the herbivore level was 50% and the assimilation efficiency of the herbivores was 40%. If the production efficiency at the herbivore level was 20%, what is the trophic efficiency between these two trophic levels (in %)?

6.
The graph shows how evapo-transpiration influences NPP. The NPP units are gram per m²/yr. What is the NPP at 30 cm evapo-transpiration in metric tons/ha/yr? Note: you need to calculate logarithms and do two metric conversions to get the right result

Evapotranspiration is a general measure of energy flow into the system- water being evaporated and transpired by plants.

As evapotranspiration increases, generally, there is more productivity in the ecosystem

Aboveground productivity (log?? g/m²)
3.50
3.25
3.00
2.75
2.50
2.25
2.00
1.75
1.50

Tropical forest
Hemlock-beech forest
Beech-maple forest
Pine forests
Chestnut-oak heath
Pine heath
Tallgrass prairie
Alpine tundra
Arctic tundra
Creosote-bush desert

2.00 2.25 2.50 2.75 3.00 3.25
Estimated actual evapotranspiration (log?? mm/yr)

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5.
Imagine a scenario where there are 2000 units of energy available at the primary producer level. The consumption efficiency to the herbivore level was 50% and the assimilation efficiency of the herbivores was 40%. If the production efficiency at the herbivore level was 20%, what is the trophic efficiency between these two trophic levels (in %)?

6.
The graph shows how evapo-transpiration influences NPP. The NPP units are gram per m²/yr. What is the NPP at 30 cm evapo-transpiration in metric tons/ha/yr? Note: you need to calculate logarithms and do two metric conversions to get the right result

Evapotranspiration is a general measure of energy flow into the system- water being evaporated and transpired by plants.

As evapotranspiration increases, generally, there is more productivity in the ecosystem

Aboveground productivity (log?? g/m²)
3.50
3.25
3.00
2.75
2.50
2.25
2.00
1.75
1.50

Tropical forest
Hemlock-beech forest
Beech-maple forest
Pine forests
Chestnut-oak heath
Pine heath
Tallgrass prairie
Alpine tundra
Arctic tundra
Creosote-bush desert

2.00 2.25 2.50 2.75 3.00 3.25
Estimated actual evapotranspiration (log?? mm/yr)

Added by Adri-N P.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Shaiju T

05/11/2022

Step 1

Since the consumption efficiency to the herbivore level was 50%, this means that only half of the energy from the primary producer level is transferred to the herbivores. So, 2000 units * 50% = 1000 units of energy are available at the herbivore level. Show more…

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Imagine a scenario where there are 2000 units of energy available at the primary producer level. The consumption efficiency to the herbivore level was 50% and the assimilation efficiency of the herbivores was 40%. If the production efficiency at the herbivore level was 20%, what is the trophic efficiency between these two trophic levels (in %)? The graph shows how evapo-transpiration influences NPP. The NPP units are gram per m²/yr. What is the NPP at 30 cm evapo-transpiration in metric tons/ha/yr? Note: you need to calculate logarithms and do two metric conversions to get the right result Evapotranspiration is a general measure of energy flow into the system- water being evaporated and transpired by plants. As evapotranspiration increases, generally, there is more productivity in the ecosystem

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Transcript

00:01 Hello student in this question it is given that the primary producer the primary producers that means the plants plants have 2 ,000 units energy so this have 2 ,000 units of energy.

00:30 Now consumption efficiency is 50 % so consumption consumption efficiency efficiency is equal to 50 % that means 50 % of the primary producers energy so it will be thousand units total half now the assimilation efficiency is 40 % so the assimilation efficiency is 40 % so the assimilation efficiency is 40 % of that of the consumption efficiency.

01:15 So it will be thousand multiplied by 40 divided by 100.

01:22 So this will, two zeros will be cancelled and this will give us a value of 400 units.

01:32 Now we have to make the production efficiency.

01:37 So, the last thing, that means the production efficiency is equal to 20 % of the assimilation energy.

01:51 So, it will be 400 multiplied by 20 divided by 100.

01:57 So here again, two zeros will be cancel out and it will be 80.

02:02 Units.

02:05 So here the traffic traffic efficiency will be equal to energy used, energy used divided by the energy initially available.

02:27 So here the energy available and that will be multiplied and that will be multiplied with 100.

02:36 So the energy used is 80 units and it will be divided by 2 ,000 because the initial available energy is this and that will be multiplied by 100.

02:49 So here two zeros will be cancelled out and this is zero will be cancelled by this.

02:54 So we will get 4 % the traffic efficiency.

03:00 Now we can say that for 30 centimeter, that means for the next question, graph is given like, so we can say that for 30 centimeter, log of x graph is given in nanometer scale, so log of x nanometer.

03:28 So this will be m and here 30 centimeter is equal to 3 .000.

03:34 300 nanometer...

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