A-Level AQA Geography Ecosystems & Processes: What is net primary productivity

Question

What is net primary productivity (NPP)?

A) NPP is the biomass (minus respiration) produced in an ecosystem. It is a measure of the rate at which an ecosystem can capture and store carbon, usually measured in gm/m²/yr.

B) NPP relates to the productivity of land for the purposes of agriculture. The addition of nitrate-based fertilizers or genetically modified crops dramatically increases NPP.

C) As plants respire they take in oxygen and release carbon dioxide. NPP is a measure of how much oxygen is produced by plants in an ecosystem. This rate is measured as O₂/m²/yr.

D) NPP is the total amount of chemical energy (as biomass) that primary producers create in a given length of time. This is the rate at which decomposition occurs in an ecosystem.

What is net primary productivity (NPP)? A) NPP is the biomass (minus respiration) produced in an ecosystem - AQA - A-Level Geography - Question 6 - 2018 - Paper 1

Worked Solution & Example Answer:What is net primary productivity (NPP)? A) NPP is the biomass (minus respiration) produced in an ecosystem - AQA - A-Level Geography - Question 6 - 2018 - Paper 1

A) NPP is the biomass (minus respiration) produced in an ecosystem. It is a measure of the rate at which an ecosystem can capture and store carbon, usually measured in gm/m²/yr.

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