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Ecology Test
on bio exam
| Question | Answer |
|---|---|
| the branch of biology dealing with interactions among organisms and b/w organisms and their enviroment is called | ecology |
| the combined portions of earth in which all living things exist is called the | biosphere |
| all of the members of a particular species that live in one area are called a | population |
| what is the original source of almost all the energy in most ecosystems? | sunlight |
| an organism that cannot make its own food is called a | heterotroph |
| organisms that obtain nutrients by breaking down dead and decaying plants and animals are called | decomposers |
| what is an organism that feeds only on plants ? | herbivore |
| what animals eat both producers and consumers? | omnivores |
| what is the term for each step in the transfer of energy and matter within a food web? | trophic level |
| what is the process by which bacteria convert nitrogen gas in the air to ammonia? | nitrogen fixation |
| nitrogen fixation is carried out primarily by | bacteria |
| the greenhouse effect is | a natural phenomenon that maintains earth's temperature range |
| which is a biotic factor that affents the size of a population in a specific ecosystem? | numbers and kinds of predators in the ecosystem |
| the symbiotic relationship b/w a flower and the insect that feeds on its nectar is an example of | a mutualism b/c the flower provides the insect with food and the insect pollinates the flower. |
| which biome is characterized by very low temperatures, little precipitation, and permafrost? | tundra |
| which two biomes have the least amount of precipitation? | tundra and desert |
| soil type , rainfall , and temperature are all abiotic factors....what is not an abiotic factor? | plant life |
| what is happening in a population as it decreases in size? | the death rate becomes higher then the birthrate |
| if a population frows larger than the carrying capacity of the enviroment, the ( ) may rise | death rate |
| what energy source fuels the water cycle? | the sun |
Created by:
aewells15
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