The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m2 per year. If respiration by the aquatic producers is 12,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year?

• 4,000

• 8,000

• 12,000

• 20,000

Which of the following would be correct units for primary productivity?

• calories/plant/year

• calories/m2/year

• m2/calorie/kg

• calories/kg/cm2

Net primary productivity (NPP) is the total amount of energy left over after

• the ground has absorbed some of it

• plants have used some of it for respiration (growth, reprocudtion)

• animals have eaten as much as they can

• sunlight hits a plants leaves 

Which ecosystem would you expect to have the highest net primary productivity?

• Open grassland with occasional trees

• An ecosystem with low soil nutrients and little sunlight

• An ecosystem with many tall trees, and dense grasses and shrubs below

• A deep, wide lake

What are the answer requirements for a describe prompt?