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ENV SC Unit 2
Study guide
| Question | Answer |
|---|---|
| What is ecology? | the study of the interactions between living organisms and their enviroment |
| 5 levels ecological organization, ecoystem is | Collection of organisims living and non living in a system together |
| 5 levels ecological, Population | All members of a single species living in the same area |
| 5 levels ecological, Biosphere | All the organisms and the parts of earth that host life. |
| 5 levels ecological, Individual | Simplest form of an organism |
| 5 levels ecological, Community | All living organisims in one area |
| What is population | a group of organisms living in the same area at the same time |
| What 2 things will cause a population to grow | immigration and births |
| What 2 things cause a population to shrink | emigration and deaths |
| What happens to growth rates if the birth rate is higher than death rate lower | Population increase |
| What happens to growth rates if the birth rate is lower than death rate is higher | Population decrease |
| What happens to the growth rate if the birth rate is equal to the death rate | Stable no growth or decline |
| What is an Age-Structure diagram? | Shows reliative number of organisms of each age group within population male/female age population size |
| What does the age-structure diagram show | number or percent of individuals in each age group |
| What are the 3 types of dispersion? | Clumped, Random, Uniform |
| What does clumped dispersion look like? | all together near a resource |
| What does Random dispersion look like? | No pattern, spreadout |
| What does Uniform dispersion look like? | evenly spaced |
| What is an abotic factor | Non-living in an ecosystem. Example: Temp, water, air, sunlight, rocks, soil |
| What is an botic factor | Parts of the ecosyatem that are alive or have been alive. Plants, animals, bacteria |
| What is a survivorship curve? | Shows the likelihood of death or survival at any time during the life cycle with age |
| Describe exponential growth | population that is increasing at a constant rate, indefinately |
| Exponential growth occurs under what conditions | resources are plentiful, conditions are ideal, perfect |
| What shape is exponential growth on a chart | J-Shaped |
| What is carring capacity | Population size that can be supported over a long period of time |
| What happens when a population is over carring capacity | overshot, limited resources, death rates rise, competition rises |
| Describe logistic growth | Period of exponential groiwth, population slows or stops growing |
| Logistic growth occurs when | When population reaches carring capacity \, and runs out of resources |
| What is the shape of logistic growth on a graph | S-Shaped |
| Can a population continue to grow expontially | No |
| Can a population continue to grow expontially why not | Resources will become scarce |
| What are liminting factors in a population | Factors causiing population to slow or stop |
| Exapmples of limiting factors are | lack of food, water,shelter, and natural disaster |
| What is density-dependent | Depends on size, food and space |
| What is density-independent | Effects everyone, Volcanic eruptions, natural disaters |
Created by:
dlaneyehs