Exam 56: Dynamics of Ecosystems

A(n)________ is a permeable underground layer of rock,sand,and gravel saturated with groundwater.

The following figure shows studies in a stream where enclosures were set up either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae?

The honey possum (Tarsipes rostratus)is a tiny Australian marsupial that feeds entirely on nectar.Which of the following terms describes the role of a honey possum in its ecosystem?

Only about ________ of the sunlight falling on plant leaves is captured by photosynthesis.

Phosphorus deficiency often appears early in plant growth and results in stunting.Which of the following are reasons why a deficiency in phosphorus would cause growth abnormalities in plants? (Check all that apply.)

Energy enters most ecosystems by the process of

In a marine ecosystem with an inverted biomass pyramid,which trophic level should have the smallest number of organisms?

Which of the following are true statements about the carbon cycle? Check all that apply.

The balance between photosynthesis and ________ is altered by the combustion of fossil fuels.

NPP is the difference between plant photosynthesis and respiration.Therefore,NPP quantifies the net absorption of what element(s)by living plants?

In which of the following ways does species richness affect ecosystem function? Check all that apply.

Which of the following are true about ecosystems? Check all that apply.

The upper,unconfined portion of the groundwater constitutes the ________,which flows into streams and is partly accessible to plants.

What feature do the carbon and nitrogen cycles have in common?

Over tropical rainforest areas,approximately 90% of the water that reaches the atmosphere comes from

In an ecosystem,the amount of organic matter produced in a given time that is available for heterotrophs is known as

The rate of production of new biomass by heterotrophs is called

According to MacArthur and Wilson's island biogeography theory,which of the following would be expected to have the smallest species richness?

Which one of the following quantities best represents the respiratory heat lost by plants in an ecosystem?

Which one of the following statements about the trophic cascade in the sea otter and sea urchin-kelp communities along the West Coast of North America are true? Check all that apply.