Flows of Energy and Matter

What is primary productivity?

• The conversion of energy into biomass in a given time

• The total amount of biomass produced by primary producers

• The amount of usable biomass in an ecosystem

• The rate of growth of plants and animals in the ecosystem

What is the difference between gross and net primary productivity?

• Gross primary productivity includes respiratory losses, while net primary productivity does not

• Gross primary productivity is the total amount of biomass produced, while net primary productivity is the amount of usable biomass

• Gross primary productivity is measured in joules, while net primary productivity is measured in grams

• Gross primary productivity is the rate of growth, while net primary productivity is the total amount of biomass

What is the equation for calculating net primary productivity?

• NPP = GPP - R

• NPP = GPP + R

• NPP = GPP * R

• NPP = GPP / R

What factors influence the rate of primary productivity in terrestrial ecosystems?

• Temperature, water availability, and solar radiation

• Salinity, water availability, and solar radiation

• Temperature, nutrient availability, and solar radiation

• Salinity, nutrient availability, and solar radiation

What is the main limiting factor for primary productivity in aquatic ecosystems?

• Light availability

• Temperature

• Nutrient availability

• Salinity

Where is primary productivity highest in terrestrial ecosystems?

• Around the equator

• In hot, dry climates

• In cold, wet climates

• In coastal areas

What is the difference between gross and net secondary productivity?

• Gross secondary productivity includes respiratory losses, while net secondary productivity does not

• Gross secondary productivity is the total amount of biomass assimilated, while net secondary productivity is the amount left for growth

• Gross secondary productivity is measured in grams, while net secondary productivity is measured in joules

• Gross secondary productivity is the rate of growth, while net secondary productivity is the total amount of biomass assimilated

What is the equation for calculating net secondary productivity?

• NSP = GSP - R

• NSP = GSP + R

• NSP = GSP * R

• NSP = GSP / R

What percentage of assimilated energy is used in respiration by consumers?

• 90%

• 80%

• 70%

• 60%

What is the sustainable yield of an ecosystem?

• The amount of biomass that can be extracted without reducing natural capital

• The total amount of biomass in the ecosystem

• The rate of growth of the ecosystem

• The amount of biomass that can be extracted without reducing primary productivity