Use the following figure to answer the question.

After looking at the experiment in the figure, what can be concluded about productivity in marine ecosystems?
A) Nothing can be said based on this information.
B) Marine organisms break down iron for energy and thus for productivity.
C) Iron can be a limiting nutrient in productivity.
D) Productivity increases when chlorophyll a is added.

Question

Use the following figure to answer the question.

After looking at the experiment in the figure, what can be concluded about productivity in marine ecosystems?
A) Nothing can be said based on this information. 
B) Marine organisms break down iron for energy and thus for productivity. 
C) Iron can be a limiting nutrient in productivity. 
D) Productivity increases when chlorophyll a is added.

Quizplus · Accepted Answer

The figure shows the relationship between iron concentration and productivity in marine ecosystems. As the concentration of iron increases, productivity also increases until a certain point, where it levels off. This suggests that iron can be a limiting nutrient in productivity. No information is given in the figure to support options A, B, or D.

Use the Following Figure to Answer the Question