Use the Following to Answer Questions

question 53

Multiple Choice

Use the following to answer questions :
Refer to the graphs below showing data from the studies of David Tilman and colleagues on the effect of species diversity on net primary productivity in prairie ecosystems.
-Based on the data in the two graphs,how can the effects of species richness and number of functional groups (niches) on NPP best be described?

• A) Increased number of niches,which is tied to increased species richness,has a major effect on increasing NPP.
• B) Increased species richness has less effect on increasing NPP than increased number of niches does.
• C) Increased number of niches is responsible for the total effect of increased species diversity on NPP.
• D) Increased species richness is responsible for the total effect of increased species diversity on NPP.
• E) Increased number of niches and increased species richness independently increase NPP.

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