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Emily logue

Biology Unit 3 key area 1&2

What is Biodiversity ? Total variation that exists amongst all living things on earth.
What is an Ecosystem? Consists of all the living organisms living in a particular habitat and the non-living components with which the organisms interact.
What is meant by non-living components? Abiotic Factors
What is a Niche and what does it involve? The role that an organism plays within the community and involves competition, predation and the conditions it can tolerate such as temperature,
What is a producer and consumer? Producer- able to produce their own food by converting light energy to chemical energy Consumer- Cannot producer own food and must consume plants or other animals to obtain energy to stay alive
Why would competition occur? Give 2 examples Can occur in an ecosystem whenever 2 or more members of the community need particular resource that is in short supply. Green plants - light and water---- Animals - water, food and mates
What is interspecific Competition? Occurs among individuals of the same species for one or a few the same resources
What is intraspecific Competition? Occurs amongst individuals of the same species for the same resources. (more intense)
What is a Biotic factor? give examples Are living factors that can affect the distribution of organisms. Food availability/predators/Disease/Competition/Grazing
What is Grazing and what re the three levels? A method of feeding in which a herbivore feeds on plants such as grass. High intensity/Moderate/Low intensity
Impact on High intensity? Moderate? Low intensity? H-Plants can become extinct M- Causes an increase in biodiversity L- Causes a decrease in biodiversity
What is a Abiotic factor ? give examples Are non-living factors that can affect the distribution of organisms. Temperature/pH/Light intensity/moisture
Why would a sample be taken? To represent a population of organisms in an ecosystem
Give examples of a sampling technique for plants and animals Plants- Quadrats Animal- Pitfall traps and net sampling
What is meant by a Indicator Species? By their presence, abundance or absence indicate environmental quality/ levels of pollution in the environment
What Is a Herbivore? Animal that feeds on plant material only
What is a Carnivore? Animal that feeds on flesh and other animal material only
What is Omnivore? Animal that eats both plants and animal material.
Created by: emilylogue