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BIO 1230 - EXAM 2
Chapter 3
| Question | Answer |
|---|---|
| What is a habitat? | The environment where an organism lives. (living and nonliving elements) |
| What is species? | A populations or group of populations |
| What is a population? | A group of individuals of a species tthat live in the same area. |
| What is Evolution? | A change over time. |
| When micro-evolution takes place what evolves? | population |
| What was her dog's name in college? | Timber the Wolf |
| What is Biological diversity (biodiversity)? | The variety of life across all levels of biological organization. |
| How many species have scientists described? | 1.8 Million |
| What is the average length of species? | 1-10 million years |
| How does biodiversity affect people directly? | Medicine Food "Food Chain" |
| What is Extinction? | The disappearance of a species from Earth. |
| What are three natural causes that can cause extinction? | severe weather, climate change, changing sea levels. |
| What is an Endemic? | Where a species only exists in a certain, specialized area. |
| Describe how a species' vulnerability affects it's extinction. | If it is a new species, if it is a small population, or if it is a specialized species. |
| What is Habitat selection? | Mobile organisms actively select habitats in which to live among the ranfe of options the encounter. |
| What are three things that affect Habitat selection? | Availability and quality and human development. |
| What is a niche? | functional role in a community. ( a summary of everything an organism does) |
| How does smaller animal affect a habitat? | Because if the animal is smaller than it will use less space. |
| What is a specialists? | species with narrow breadth, and very specific requirements |
| What are some characteristics of a specialists? | They are good at what they do, but they are vulnerable if conditions change. |
| What are some characteristics of a generalists? | able to live in many different places and weather variable conditions, but they may not thrive in any one situation. |
| What is a generalist? | species with broad niche, which uses a wide array of habitats |
| What is population size? | number of individuals |
| what is population density? | number of individuals per unit area |
| Larger areas usually have ____ density | lower |
| What is sex ratio? | portion of males to females |
| What is age distribution? | relative numbers of organisms of each age in population |
| What are the four factors of population change? | Natality (Births), Mortality (Deaths), Immigration (Arrival), Emigration (Departure). [No Monkeys In Europe] |
| What is an Exponential population growth? | Where a population increases by a fixed percent (J-shaped curve) |
| When does exponential population growth occur in nature (four things)? | Small population, low competition, ideal conditions, manipulations of the environment (humans) |
| What are limiting factors? | Physical. chemical, and biological attributes of the environment THAT RESTRAIN POPULATION GROWTH. |
| What does limiting factors determine? | carrying capacity |
| What are some factors that contribute to environmental resistance? | Space, Food, Water, Mates, Shelter, Suitable breeding sites, Temperature, Disease, Predators |
| What are some factors that contribute to environmental resistance (aquatic systems)? | Salinity, Sunlight, Temperature |
| What is Environmental resistance? | it stabilizes the population size at it's carrying capacity. |
| What is a Logistic growth curve? | (S-Shaped Curve) Rises sharply at first but then begins to level off as the effects of limiting factors become stronger. |
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