GCSE biology Index of notes on natural cycles and decomposition igcse/O level/gcse 9-1 biology revision notes examinations

GCSE level School biology notes: Carbon, nitrogen & water cycles, factors affecting decay rate

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GCSE level biology: INDEX of 'CYCLES' revision notes

including the biological recycling of materials: Carbon Cycle, Nitrogen Cycle, Water Cycle, Decomposition - decomposers and useful decay - What are they all about?

All cycles explained with examples, including some experimental investigations

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Sub-index for this section on natural cycles and decomposition

(1) Introduction to natural cycles in the Earth's biosphere

(2) The Carbon Cycle

(3) The Nitrogen Cycle

(4) The Water Cycle

(5) Decomposition - importance, factors affecting rate of decay of material by decomposers

(6) An experiment to investigate the effect of temperature on the rate of decay of milk

(7) Biogas from waste: process, generator designs, rate factors, 'pros and cons, biofuels'

(8) Making compost - a natural organic fertiliser

(9) Fungal and bacterial decay and methods of food preservation

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Ecosystems - biotic & abiotic factors - interactions between organisms - interdependency

Food chains, food webs and biomass

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