Credit Sprint / Practice problems / Net primary productivity

Net primary productivity practice problems

Biology Unit 8. Try each one, then open the worked solution. The Credit Sprint app generates unlimited new versions with fresh numbers.

Problem 1.

An ecosystem's gross primary productivity is 3,900 kcal/m²/yr and producers use 1,560 kcal/m²/yr in respiration. What is the net primary productivity?

Show solution

NPP = GPP − R = 3900 − 1560 = 2340 kcal/m²/yr.

Problem 2.

An ecosystem's gross primary productivity is 5,100 kcal/m²/yr and producers use 2,550 kcal/m²/yr in respiration. What is the net primary productivity?

Show solution

NPP = GPP − R = 5100 − 2550 = 2550 kcal/m²/yr.

Problem 3.

An ecosystem's gross primary productivity is 4,500 kcal/m²/yr and producers use 2,700 kcal/m²/yr in respiration. What is the net primary productivity?

Show solution

NPP = GPP − R = 4500 − 2700 = 1800 kcal/m²/yr.

Problem 4.

An ecosystem's gross primary productivity is 5,200 kcal/m²/yr and producers use 1,560 kcal/m²/yr in respiration. What is the net primary productivity?

Show solution

NPP = GPP − R = 5200 − 1560 = 3640 kcal/m²/yr.

Problem 5.

An ecosystem's gross primary productivity is 7,400 kcal/m²/yr and producers use 3,700 kcal/m²/yr in respiration. What is the net primary productivity?

Show solution

NPP = GPP − R = 7400 − 3700 = 3700 kcal/m²/yr.

Problem 6.

An ecosystem's gross primary productivity is 2,100 kcal/m²/yr and producers use 840 kcal/m²/yr in respiration. What is the net primary productivity?

Show solution

NPP = GPP − R = 2100 − 840 = 1260 kcal/m²/yr.