Multiple Choice
If a capybara has a net production efficiency of 15% and consumes 1800 kJ of grass in a day, 1150 kJ of which is assimilated, roughly how much energy will be converted to new biomass?
52. Ecosystems
Making Sense of Ecosystem Production & Efficiency
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Which of the following terms describes NPP?
A
Total energy captured by primary producers in an ecosystem.
B
Energy invested in the production of new biomass by autotrophs.
C
Energy invested in new biomass by primary consumers.
D
None of the above.
Verified step by step guidance1
Understand the concept of NPP: Net Primary Productivity (NPP) is the rate at which all the plants in an ecosystem produce net useful chemical energy. It is the amount of energy that remains after subtracting the energy used by plants for respiration.
Differentiate between GPP and NPP: Gross Primary Productivity (GPP) is the total amount of energy captured by autotrophs (primary producers) through photosynthesis. NPP is the portion of GPP that is available for growth and reproduction of plants, after accounting for the energy used in respiration.
Identify the correct definition: NPP is specifically the energy invested in the production of new biomass by autotrophs, which are organisms that produce their own food from inorganic substances.
Eliminate incorrect options: The option 'Total energy captured by primary producers in an ecosystem' describes GPP, not NPP. The option 'Energy invested in new biomass by primary consumers' is incorrect because primary consumers are heterotrophs, not autotrophs.
Conclude with the correct choice: The correct description of NPP is 'Energy invested in the production of new biomass by autotrophs.'
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