Which term refers to the rate at which energy is converted to biomass by producers?

Prepare for your Environmental Science Exam 1 with our interactive quiz. Test your knowledge with various question types featuring detailed explanations. Start today and ace your exam!

Multiple Choice

Which term refers to the rate at which energy is converted to biomass by producers?

Explanation:
Energy flow in ecosystems begins with producers capturing light energy through photosynthesis. The total energy they fix is called gross primary production. But plants also use energy for their own metabolism and maintenance through respiration. The energy that remains after subtracting respiration is stored as new biomass, and that rate of accumulation is net primary production. So the term that refers to the rate at which energy is converted to biomass by producers is net primary production. The other terms don’t fit as precisely: gross primary production is the total energy fixed before accounting for respiration, and productivity is a broader, less specific term.

Energy flow in ecosystems begins with producers capturing light energy through photosynthesis. The total energy they fix is called gross primary production. But plants also use energy for their own metabolism and maintenance through respiration. The energy that remains after subtracting respiration is stored as new biomass, and that rate of accumulation is net primary production. So the term that refers to the rate at which energy is converted to biomass by producers is net primary production. The other terms don’t fit as precisely: gross primary production is the total energy fixed before accounting for respiration, and productivity is a broader, less specific term.

More practice questions