Topic 5A 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelEdexcel Created by: IonaharCreated on: 29-01-23 11:39 What is an ecosystem? All the organisms living in a particular area and all non-living factors 1 of 32 What is a habitat? The place where organisms live 2 of 32 What is a population? All the organisms of one species in a habitat 3 of 32 What is population size? The number of individuals of one species living in one area 4 of 32 What is a community? All organisms of different species living in the same habitat and interacting with each other 5 of 32 What are abiotic and biotic factors? 1-Non living feature of the ecosystem e.g. temperature 2-living factors e.g. predators or food 6 of 32 What is abundance? Population size 7 of 32 What is distribution? where an organism is in a particular area 8 of 32 What 2 things cause population size to vary? -Abiotic factors -Biotic factors 9 of 32 Explain how abiotic factors could affect population size? When abiotic factors are ideal ( Light, Temperature, water ) the species/organism will grow fast 10 of 32 What happens to a species when abiotic factors aren't ideal? The species does not grow 11 of 32 Name 4 examples of abiotic factors? -light -temperature -wind -water 12 of 32 Name 3 ways biotic factors can affect a species? -Interspecific competition - Intraspecific competition -Preparation 13 of 32 What is interspecific competition? competition between different species for recourses 14 of 32 How does interspecific competition affect population size? It reduces resources and causes both species size to reduce 15 of 32 What is carrying capacity? The maximum stable population size of a species that an ecosystem can support 16 of 32 How does predication affect population size? When prey increases or decrease so does the predator 17 of 32 How does distribution also vary? Abiotic and biotic factors 18 of 32 Why do abiotic factors affect distribution? Some organisms can survive in certain abiotic factors and therefore won't be found in that area 19 of 32 How does interspecific affect distribution? If one species is better adapted they will out compete the other one 20 of 32 What is a niche? the role of an organism within its habitat, including its abiotic and biotic interactions 21 of 32 What is succession? The process by which an ecosystem changes over time. The biotic factors change as the abiotic factors change 22 of 32 Name the 2 type of succession? -Primary succession -Secondary succession 23 of 32 What is primary succession? This happens on a newly exposed land, where there is o soil or organic material just rock 24 of 32 What is secondary succession? This happens on land that has been cleared ,and only soil remains 25 of 32 What is the name of the species that colonises the new land surface? A pioneer species 26 of 32 What allow pioneer to change the abiotic factors? They are specially adapted 27 of 32 What do the pioneer species leave when they die? Organic materials 28 of 32 What do these organic materials left behind do? they make the environment less hostile, allowing other species to grow on it 29 of 32 What is secondary succession? It happens in the same way but there is soil to start with, so succession is happening at a different stage 30 of 32 What is the final stage of succession called? A climax community 31 of 32 What is a climax community? The ecosystem is supporting the largest and most complex community of plants and animals it can. And it wont change much more 32 of 32
Essay 22: The transfer of energy between different organisms and between these organisms and their environment 0.0 / 5
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