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Biology Unit 3 key area 1&2
Question | Answer |
---|---|
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. |