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Description
Flashcards by Deleted user, updated more than 1 year ago
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Created by Seren Jones
over 8 years ago
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Copied by Ashley Lewis
over 7 years ago
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| Question | Answer |
| What is a quadrat? What is it used for? | A square frame used to measure the biodiversity in an area |
| What is a transect? What is it used for? | A set of samples taken down a line to measure the change in populations along a gradient |
| If you are carrying out sampling of an environment, what kind of things must you consider? | It must be typical of the whole area It must not affect the results (some animals may be scared away by humans) The quadrats must be placed randomly to avoid bias |
| What is capture / recapture? | The method used to estimate the population of a species. |
| What is biodiversity? | The variety of different species in a given area |
| Why is biodiversity important? | The more species in an area, the more stable the ecosystem is. It also provides potential foods, industrial materials and new medicines. |
| Name 4 ways we can protect biodiversity and endangered species | Sites of Specific Interest (SSI's) CITE's Seed banks Captive breeding programmes National parks Fishing quotas |
| What is an alien species? | A species that is not native to a certain country or region but has been introduced |
| What is a biological control agent? | A living organism used to control the population of a pest species |
| How has the approach to biological control changed over the years? What is now done before biological controls are released | Large scale field trials are now used because scientists are aware that the biological control can turn into a pest itself which is then difficult to control, such as the Japanese knotweed. |
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