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| As of 2008, approximately how many humans live on the earth? |
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Definition
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Term
| The purpose of a population model is to: |
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Definition
| predict or explain changes in an organism's abundance from one generation to the next. |
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| Which statement best describes expectations for world human population by the year 2010? |
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Definition
| It will exceed 7 billion if the current rate of increase continues. |
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Term
| When plants of a particular species are growing too close to each other, crowding may eventually lead to mortality, known as self-thinning. This type of mortality is: |
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Definition
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| A survivorship curve that had low survivorship in the beginning and stabilized after high initial mortality would be characteristic for which type of organism? |
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Definition
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| A population with an S-shaped growth curve is said to exhibit _____________ growth. |
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Term
| Which of the following mammals would you expect to have the shortest gestation period? |
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Term
| The population size that a particular habitat can support indefinitely is called the: |
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Definition
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Term
| Populations that exhibit logistic growth still exhibit exponential growth. This statement is: |
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Definition
| true; populations exhibiting logistic growth go through a period of exponential growth before growth rates level off around zero. |
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Term
| Population density is determined by the number of: |
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Definition
| individuals of a species in a given area. |
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Term
| What may happen when a population exceeds its carrying capacity? |
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Definition
| Both a) and d) are possible. |
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Term
| What type of effect has an increasing impact as the population size increases? |
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Definition
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Term
| Density-dependent and density-independent factors influence the growth of a population by causing changes in the: |
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Definition
| birth rate and death rate. |
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Term
| A population with a higher death rate than birth rate may still have positive growth. This statement is: |
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Definition
| correct; if immigration rates plus birth rates are greater than death rate plus emigration rate, population growth will still be positive even if birth rate is lower than death rate alone. |
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Term
| The 20 female adults in a small population each have a probability of 0.5 of producing a single offspring each year and a probability of 0.5 of producing no offspring. How many offspring will be produced each year? |
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Definition
| 10 offspring per year on average, with some variation around this average |
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Term
| A graph illustrating the proportion of individuals in a population that live to a given age is called a(n): |
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Definition
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Term
| The death rate of organisms in a population exhibiting a Type III survivorship curve is: |
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Definition
| lower after the organisms survive to the critical age of establishment. |
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Term
| Which of the following best exemplifies an organism with a Type I survivorship curve? |
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Definition
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Term
| Mutations that cause sickness and death after reproduction: |
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Definition
| can be passed on to future generations. |
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Term
| On average, in stable populations, which leaves more offspring that survive to become adults and reproduce: a pair of elephants or a pair of rabbits? |
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Definition
| If both populations are stable, then the pair of elephants and the pair of rabbits will leave the same number of offspring that survive to become adults and reproduce. |
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