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- 1ECOSYSTEMA physical environment with a particular set of conditions, plus all the orgainisms in it.
Can be natural or artificial - 2NATURAL ECOSYSTEMSHave high biodiversity.
Different types of plants and organisms coexist in the same environment.
examples: lakes and natural woodland - 3ARTIFICIAL ECOSYSTEMSAre set up and maintained for a particular purpose so have low biodiversity.
Weedkillers, Pesticides and fertilisers are used to prevent other plants and organisms growing alongside crops. - 4why do forestry plantations have low biodiversity comp to natural woodlands?-havent been estabilished for long.and result from interactions and relationships between organisms
-because the few species introduced at the start may not survive. - 5Why do fish farms have low biodiversity in comp to lakes?-existed a shorter time
-In the absence of predators, some fish species thrive while other don't.
-Fewer diseases so results in too much of certain species. - 6HabitatIs part of a physical environment, where an animal or plant lives.
An organisms adapts to it so are limited to only living there. - 7CommunityTotal number of individuals from the different populations of plants and animals that live in a habitat at once.
- 8PopulationTotal no of individuals of the same species at one time.
- 9why are ecosystems self supporting?provide their own mates , shelter but only rely on energy source, sun and producers at the bottom of the food chain.
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- biology Flashcards on Untitled, created by iram_sonia5 on 02/06/2013.
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