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Biology U4 Test
| Question | Answer |
|---|---|
| can be produced or replaced (wind, solar) | renewable resources |
| can't be replenished in a reasonable amount of time (oil-fossil fuels | non-renewable resources |
| variety of species in an area | biodiversity |
| when a species disappears | extinction |
| low numbers of a species, could be extinct | endangered species |
| species is likely to be endangered | threatened species |
| destroyed due to human actions | habitat loss |
| What are some examples of habitat loss? | deforestation and polluting the coral reef |
| protecting biodiversity | conservation |
| What is an example of a law of conservation? | Endangered Species Act of 1973 |
| Nitrogen runoff from what causes algal blooms because plants love nitrogen/ kills fish (dead zone) | fertilizer |
| How are wetlands destroyed? | oil ships create channels |
| measurement of the number of individuals living in a defined space | population density |
| FIND POPULATION DENSITY!! | |
| how a population is spread in an area | population dispersion |
| individuals gather into groups where resources are available | clumped population |
| same species must compete for limited resources and territory | uniform population |
| resources evenly distributed | random population |
| What is an example of a clumped population? | school of fish |
| What is an example of a uniform population? | nesting penguins being territorial over eggs |
| What is an example of a random population? | sloth in tropical forests-no competition and few predators |
| What affects population growth? | births, deaths, migration |
| population size increases dramatically over a relatively short time | exponential growth |
| What does exponential growth have? | available resources and space |
| population begins with a period of slow growth followed by a period of exponential growth before leveling off at a state size | logistic growth |
| What happens during logistic growth? | resources are reduced and growth slows down |
| competition, disease, over crowding | density dependent |
| natural disasters | density independent |
| amount of organisms an ecosystem can support | carrying capacity |
| stable community | climax community |
| CARRYING CAPACITY LEADS TO CLIMAX COMMUNITY!! | |
| What is an example of a climax community? | a pond with the ideal amount of fish, space, and resources |
| What happens if carrying capacity is exceeded? | nature usually corrects itself with organisms dying because of lack of resources |
| What is succession? | change |
| What is primary succession? | completely destroyed |
| What is an example of primary succession? | ice age, mass volcanoes |
| What is secondary succession? | partly destroyed and can come back relatively soon |
| What is an example of secondary succession? | flood, fire |
| the 1st species to occupy an area (usually producers) | pioneer species |
| a specific place or role for an organism in an ecosystem | niche |
| Can two species share the same niche in the same habitat? | no |
| causes species to divide resources | competition |
| organism feeds on another | predation |
| a species that can change an ecosystem dramatically | keystone species |
| when organisms from a relationship | symbiosis |
| both species benefit | mutualism |
| one benefits other is not harmed or helped | commensalism |
| one benefits, one is harmed | parasitism |
| What is an example of mutualism? | deer and birds on backs, bee/ flower |
| What is an example of commensalism? | clownfish and sea anemone, whale/ barnacle |
| What is an example of parasitism? | tapeworms and humans |
| STUDY WORKSHEETS!!! |
Created by:
colorguard101
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