Exam 46: Ecosystems

Respond to the following statements with reference to the five trophic categories listed below. -A bear eating blueberries is functioning as this.

Primary producers obtain energy from a(n)__________ source and use it to build organic compounds from inorganic starting materials.

In a majority of land ecosystems,most energy in producers flows directly to ____.  

Energy ____ in an ecosystem and nutrients ____.  

Choose the one most appropriate answer for each. -Net primary production

When all the precipitation in a small valley feeds a particular stream,the valley is referred to as ____.  

An energy pyramid illustrates ____.  

Choose the one most appropriate answer for each. -Biogeochemical cycles

__________ food webs tend to predominate in most land ecosystems.

Most rainfall returns water directly to ____.  

What is an array of organisms and their physical environment,all interacting through a one-way flow of energy and a cycling of nutrients?  

A biomass pyramid illustrates the ____ of all organisms at each trophic level.  

Choose the one most appropriate answer for each. -Bicarbonate

What is not consequence of the rise in the average global temperature?  

Respond to the following statements with reference to the four steps of the nitrogen cycles listed below. -The process whereby nitrite is converted to nitrate is an important part of this process.

A network of interactions that involves the cycling of materials and the flow of energy among organisms and their physical environment is ____.  

Which of the following are in order from primary producer to fourth trophic level?  

Which of the following tends to predominate in land ecosystems?  

Over hundreds of millions of years,high pressure and temperature transformed ____ into deposits of oil and natural gas.  

Which of the following feed on organic wastes and remains and break them down into inorganic building blocks?