1) NPP = 1000 energy units and 200 units of energy are consumed (ingested) by he
ID: 61622 • Letter: 1
Question
1) NPP = 1000 energy units and 200 units of energy are consumed (ingested) by herbivores. Of this 200 units, 50 units are assimilated by herbivores and 150 units are excreted as waste. Which of the following statements are true?
Consumption efficiency (I/NPP) is 25%.
Production efficiency (P/A) is 25%.
Assimilation efficiency (A/I) is 25%
Trophic efficiency is 25%
2)Most organic matter in detritus, soil, or litter is eventually decomposed. Provide an example of organic matter or an organic molecule that is an exception to this rule.
3) A plant in the Campus Forest grows a new leaf using carbon and energy acquired in the current year and carbon is initially stored in the leaf tissue. The leaf is eaten by an herbivore and some of the carbon from the leaf is respired as CO2. Which of the following is true about the carbon that has been respired? (You may pick more than one answer).
It counts as part of GPP (Gross Primary Production) for the current year in the Campus Forest.
It counts as part of NPP (Net Primary Production) for the current year in the Campus Forest.
It counts as part of NEP (Net Ecosystem Production) for the current year in the Campus Forest.
It counts as part of a positive change in stored carbon ( + corg) in the Campus Forest for the current year.
Which of the following factors would be likely to increase decomposition rates a boreal forest? (You may pick more than one answer)
Warmer temperatures with normal levels of precipitation.
Normal temperatures with increased levels of precipitation.
A shift in tree species composition from spruces with high-lignin needles to birch with with low-lignin leaves.
An increase in the abundance of fungi in the soil and litter layer.
aConsumption efficiency (I/NPP) is 25%.
bProduction efficiency (P/A) is 25%.
cAssimilation efficiency (A/I) is 25%
dTrophic efficiency is 25%
Explanation / Answer
1. option b (Production efficiency is 25%)
Production efficiency = net secondary production *100/ Assimilation = 50*100/200 = 25%
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