ECOLOGY
ENERGY FLOW AND PRIMARY PRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Net
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Total
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Gross
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None of the above
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Detailed explanation-1: -primary productivity, in ecology, the rate at which energy is converted to organic substances by photosynthetic producers (photoautotrophs), which obtain energy and nutrients by harnessing sunlight, and chemosynthetic producers (chemoautotrophs), which obtain chemical energy through oxidation.
Detailed explanation-2: -There are two aspects of primary productivity: Gross primary productivity – The total amount of energy produced in an ecosystem. Net primary productivity – The amount of energy used by the producer for respiration.
Detailed explanation-3: -o In order to stay alive, producers have to use some of the chemical energy they store in biomass. o Net primary productivity (NPP) is the rate at which producers use photosynthesis to produce and store chemical energy minus the rate at which they use some of this stored energy through aerobic respiration.
Detailed explanation-4: -So, the correct answer is ‘The amount of light energy converted to chemical energy by photosynthesis per unit time minus the energy used by primary producers for respiration’.