Q11. Which of the following formulas provides the proper definition of net prima
ID: 33955 • Letter: Q
Question
Q11. Which of the following formulas provides the proper definition of net primary production?
A.)NPP = GPP + Ra
B.) NPP = GPP - Ra
C.) NPP = Ra - GPP
D.) NPP = GPP/Ra
Q12. Which of the following statements about ecosystems are true?
Check all that apply:
A.)An ecosystem is a dynamic, interacting, interrelated set of biotic and abiotic components found in a particular location.
B.) Energy flows through ecosystems while materials tend to cycle within them.
C.) Ecosystems can be very large or very small.
Q43. To measure primary production of algae in a stream, you place two sealed chambers in the stream, each enclosing the sediments as well as the water above them. One chamber is covered with black tape (blocking all light) while the other is transparent to light.
You measure dissolved oxygen (DO) before and after a 24-hour incubation. DO in the light chamber increases by 30 mg/m2 while DO in the dark chamber decreased by 10 mg/m2.
What is the estimated Re for the stream?
------ mg O2 m-2 day-1
Q44. What is the stream's esitmated NEP?
--------- mg O2 m-2 day-1
Q45. Based on these data, what was the stream's GPP?
----------- mg O2 m-2 day-1
Q46. The position of Earth's continents has shifted dramatically over its history. Imagine that all of Earth's land mass was bunched together with approximately equal areas above and below the Equator. Assume that seasonal patterns of growth and respiration are otherwise similar, with the Northern Hemisphere's summer occurring June-August and the Southern Hemisphere's summer occurring December-February.
How will this new configuration affect seasonal swings in average global CO2?
A.) Seasonal swings would be larger, but CO2 would still peak in late April.
B.) Seasonal swings would be similar, but CO2 would now peak in late August.
C.) Seasonal swings would be larger, but CO2 would now peak in late August.
D.) Seasonal swings would be much smaller, perhaps even undetectable.
Explanation / Answer
Answer 11 B) NPP = GPP - Ra
Reason - NPP stands for Net primary productivity which represent the amount of stored organic matter per unit area in per unit time by a producer. while GPP stands for gross primary productivity which represent the amount of synthesized organic matter per unit area in per unit time by a producer. amount of energy lost from gross primary productivity to the net primary productivity is the amount of respiration energy.
therefore, NPP equals the Respiration amount from GPP excluded.
NPP = GPP - Ra
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