Term
| An _?_ includes both the living communities and the physical (non-living) environment |
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Definition
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Term
| Plants are photoautotrophs; both of these could also be called: _?_ _?_ |
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Definition
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Term
| _?_ get their energy by feeding on "others" such as plants |
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Definition
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Term
| Explain the difference between detritivore and decomposer |
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Definition
| detrivore decaying, decomposer waste |
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Term
| Most humans would be classified as _?_-vores because they eat both plant and animal material |
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Definition
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Term
| In energy transfers, _?_ can be recycled but only _?_ flows. |
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Definition
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Term
| The word "trophic" means _?_ |
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Definition
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Term
| Primary producers (plants mostly) are at the _?_ trophic level. |
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Definition
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Term
| "Who eats whom" describes the concept of the _?_ chain |
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Definition
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Term
| What is the usual number of steps in a natural food chain? |
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Definition
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Term
| Approximately what percentage of energy in one trophic level ends up in the tissues of an organism at the next higher trophic level? |
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Definition
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Term
| The interconnection of several food chains describes a food _?_ |
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Definition
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Term
| Describe the difference between a grazing food chain and a detrital food chain |
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Definition
grazing - energy flows to herbivores
detrital - energy flows to detrivores. |
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Term
| Why are ecological pyramids of that particular shape? |
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Definition
| Primary producers make up more biomass than top carnivores. |
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Term
| What is the technical difference between a biomass pyramid and an energy pyramid? |
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Definition
| biomass pyramid shows organic material, energy pyramid shows energy that flows. |
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Term
| What percent of the energy in the herbivores gets into the carnivore level just above it? |
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Definition
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Term
| In a biogeochemical cycle, materials must cycle through both the bio-(_?_) component and the _?_ (Earth) component. |
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Definition
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Term
| The water cycle is a rather simple movement of water from the ocean to the _?_ and _?_ back to the ocean |
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Definition
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Term
| Energy from the _?_ provides power for the water cycle |
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Definition
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Term
| About what percent of the Earth's surface is covered by ocean? |
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Definition
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Term
| Water flowing past New Orleans in the Mississippi River has drained from about what percent of USA land? |
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Definition
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Term
| Ground water describes water under the surface that is between soil particles (_?_ water) plus water that has drained through and collected in underground pools called _?_ |
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Definition
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Term
| What percent of freshwater is used for agricultural irrigation in the US? |
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Definition
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Term
| Most of the carbon held in the atmosphere is in a gaseous form called _?_ _?_. |
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Definition
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Term
| Plants take up carbon dioxide and put the carbon into carbohydrates during a process known as _?_ |
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Definition
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Term
| Breakdown of carbohydrates during _?_ _?_ releases the carbon dioxide back into the air. |
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Definition
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Term
| The burning of _?_ _?_ is an "unnatural" act that contributes to greenhouse gases. |
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Definition
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Term
| Excess greenhouse gases may be contributing to _?_ _?_ change. |
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Definition
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Term
| Gaseous nitrogen makes up _?_ percent of the atmospheric gases? |
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Definition
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Term
| What happens during nitrogen fixation? |
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Definition
| bacteria break N bonds in N2 use atoms to form ammonia which is ionized in water as ammonium |
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Term
| What organisms can convert the gaseous nitrogen to compounds that plants can absorb and use? |
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Definition
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Term
| What does denitrification accomplish? |
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Definition
| converts nitrates or nitrites to nitrogen gas |
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