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| Pregunta | Respuesta |
| what is intraspecific competition? | the competition that occurs between members of the same species |
| what is interspecific competition? | The competition that occurs between members of different species |
| What is meant by the term abiotic factor? | A non-living factor within an ecosystem |
| What is meant by a biotic factor? | Living factors in an ecosystem |
| What is meant by community? | Populations of all the different species |
| What is a population? | All the organisms of one species in a habitat |
| What is a species? | A group of similar organisms that can reproduce to give fertile offspring |
| What is meant by birth rate? | The number of live births per year per 1000 people in the population |
| What is meant by death rate? | The number of people that die each year per 1000 people in the population |
| What is meant by life expectancy? | The age at which someone born into the population is expected to live to |
| What is meant by population growth rate? | How much the population increases or decreases by each year |
| What is shown by a survival curve? | Shows the percentage of all individuals that were born in a population and are still alive at a given age |
| How would the mark-release-recapture technique be used in estimating population size | A sample would be caught and marked in a harmless way e.g...... and then released a second sample would then be caught and the marked would be counted the population size can then be estimated by: number in sample 1 x number in sample 2 /number marked in sample 2 |
| How can a graph be used to calculate the amount of quadrats needed | below optimum point - too few as number of species still rising above optimum point - total number of species has levelled so no need for extra effort |
| how should quadrats be used | they should be distributed randomly to avoid bias |
| what can be seen from a growth curve? | shows if the population is increasing or decreasing at a given time |
| what does an age-population pyramid show? | shows how many males and females there are in different age groups in a population |
| what is the equation for population growth rate? | birth rate - death rate (/1000 x100) |
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