Refer to the Graph, Which Is from Tilman's Study on Species

question 178

Multiple Choice

Refer to the graph, which is from Tilman's study on species diversity and community function in grassland ecosystems.It shows the change in efficiency of nitrogen use correlated with number of species in a community. Based on the graph, one can conclude that as species richness increases,

• A) nitrogen use decreases and nitrogen soil content increases.
• B) nitrogen use increases and nitrogen soil content decreases.
• C) both nitrogen use and nitrogen soil content increase.
• D) both nitrogen use and nitrogen soil content decrease.
• E) nitrogen use appears to decline but individual points show it is random.

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Definitions:

Air Pressure

The force exerted onto a surface by the weight of the air above that surface in the atmosphere of Earth.

Auditory System

is the sensory system that is responsible for the perception of sound, including its reception, transmission, and processing.

Sensation

The initial process of detecting and encoding environmental energy by the sensory organs and sending this information to the brain.

Perception

The process of organizing and interpreting sensory information to make sense of the world around us.