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Edexcel GCSE Biology Topic 9 - Ecosystems And Material Cycles 





Below is everything the examiners think you know, if you're not sure of something click on the link to watch my YouTube video explanation. For a copy of these you can print off, get the FREE revision guide I wrote for you.


 • I can describe the levels of organisation in an ecosystem

 • I can define the term community

 • I can describe interdependence in a community

 • I can describe competition in a community

 • I can define the term ecosystem

 • I can define the term abiotic factor

 • I can recall a list of abiotic factors including; light intensity, temperature, water levels, pH, ion content, wind, carbon dioxide and oxygen levels

 • I can describe how a change in abiotic factors could affect a community

 • I can define the term biotic factor

 • I can describe how a change in biotic factors could affect a community

 • I can recall a list of biotic factors including; food, predators and pathogens.

 • I can describe what an organism needs to survive and reproduce

 • I can describe what different organisms compete for

 • I can define parasitism

 • I can define mutualism

 • I can describe how to use a quadrate

 • I can describe how to use a transect

 • I can describe how to determine the abundance and distribution of species in an ecosystem

 • I can describe where the biomass on Earth comes from

 • I can draw a food chain

 • I can explain where the energy is a food chain comes from

 • I can define the term trophic level Biology only

 • I can use number to represent trophic levels Biology only

 • I can describe the differences between the trophic levels Biology only

 • I can construct a pyramid of biomass Biology only

 • I can interpret a pyramid of biomass Biology only

 • I can explain how energy is lost between trophic levels Biology only

 • I can recall that roughly 10% of the energy is transferred to the next trophic level Biology only

 • I can define the term biodiversity

• I can explain the need for biodiversity

 • I can describe the impact that humans have on biodiversity.

 • I can discuss the impact of fish farming

 • I can discuss the impact of introduction of non-indigenous species

 • I can discuss the impact of eutrophication

 • I can describe how humans can have a positive and a negative impact on biodiversity

 • I can discuss the range of programmes that aim to reduce the negative effect of humans on biodiversity

 • I can define the term food security Biology only

 • I can explain the factors affecting food security Biology only

 • I can describe the need to find sustainable methods for food production Biology only

 • I can describe ways to improve the efficiency of food production Biology only

 • I can describe why some farmers use high protein food Biology only

 • I can describe the need for sustainable fisheries Biology only

 • I can explain the methods used to keep fish stocks at a sustainable level Biology only

 • I can describe the advances in biotechnology as they apply to agriculture Biology only

 • I can recall that materials are recycled through biotic and abiotic part of an ecosystem and provide building blocks for the future

 • I can describe the role of microorganisms in cycling materials

 • I can define the terms decay and decomposition

 • I can describe the carbon cycle

 • I can describe the water cycle

 • I can describe the nitrogen cycle

 • I can evaluate the use in indicator species Biology only

 • I can describe how differences in temperature can affect the rate of decomposition Biology only

 • I can describe how differences in oxygen can affect the rate of decomposition Biology only

 • I can describe how differences in water can affect the rate of decomposition Biology only

 • I can explain why gardeners compost Biology only