12084883
Description
Flashcards by Mrs Z Rourke, updated more than 1 year ago
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Created by Mrs Z Rourke
about 6 years ago
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| Question | Answer |
| What 2 groups can plants be classified into? | Flowering plants and non-flowering plants |
| What 2 groups can animals be classified into? | Vertebrates and invertebrates |
| What is meant by the term morphological adaptations? | The features that an organism has to enable them to survive in their environment e.g. fur, large ears etc |
| What is meant by the term behavioural adaptations? | What an organism does to enable it survive in their environment e.g. hibernation |
| What 4 things do organisms compete for in their environment? | Food Water Light Minerals |
| What factors may affect population numbers? | Predators Competition for resources Disease Pollution |
| What is the difference between interspecific and intraspecific competition? | Interspecific - competition between different species Intraspecific - competition between members of the same species |
| What equipment do you need to sample a field of daisies? | Quadrat |
| Why do you need a large sample size? | There will be a greater chance that you will have the true value that needs to be estimated |
| When using capture-recapture technique to estimate a sample size, what assumptions are made? | No death No immigration No emigration The marking technique does not affect chances of survival |
| Why are biological control agents used? | This is a non-chemical way to control the numbers of unwanted organisms |
| Advantages of biological control agents. | 1. No chemicals are used so there's less pollution, disruption of the food chain and risk to people eating the food that has been sprayed 2. There's no need to keep repeating the treatment like you would with chemical pesticides |
| Disadvantages of biological control agents. | 1. The predator you introduce may not eat the pest 2. The predator could eat a useful species 3. The predators population may increase and get out of control 4. The predator may not stay in the area where it is needed |
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