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Biology Re-Takes

Terms

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What are autotrophs?
self feeding organisms
what do saprophytes eat?
dead organic matter
what do scavengers eat?
prey-meat. dead matter
symbiosis
a close nutritional relationship between two organisms
commensalism
benefit/unaffected
mutualism
benefit/benefit
parasitism
benefit/harmed
what is a niche?
the role organism play in enviorment. what they eat, what eats them, interactions. so on.
what happens when two organisms occupy the same niche?
competition
squirrel-chipmunk
what do humans to do ecosystems?
disrupt them
give three examples of how humans impacted the stability of an ecosystem?
-biocide
-urbanization
-pollution
-landfills
what is biodiversity?
number of different types of organisms that live on the earth
what is the value of biodiversity?
genetics/medicine/prevention of ecosystem collapse
what is biological magnificcation?
the process of passing toxic substance through a food chain. this results in a high level of the toxins in higher order consumers.
give three examples of how humans have tried to restore the enviorment
1. pollution control
2. recycling
3. soil conservation
4. forest conservation
5. biological control of pest
-alternativees to pesticidde
what is the difference between a community and an ecosystem?
the physical enviorment

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