P17 Organising an Ecosystem
- Created by: Lucy Hart
- Created on: 25-01-20 09:10
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- 17 Organising an Ecosystem
- 17.1 Feeding Relationships
- photosynthetic organisms are the producers of biomass
- producer -> primary consumer -> secondary consumer -> teritary consumer
- 1. plenty food avaiable -> prey numbers increase
- 2. Prey goes up -> predator numbers go up
- 3. high number of predator numbers eat large population of prey
- 4. prey decrease -> predators decrease
- 3. high number of predator numbers eat large population of prey
- 2. Prey goes up -> predator numbers go up
- 17.2 Materials Cycling
- look at water cycle
- look at decay cycle
- 17.3 Carbon cycle
- 1. photosynthesis
- green plants remove CO2 from the atmosphere for photosynthesis, to make carbs, proteins + fats
- CO2 + H2O -> glucose + oxygen
- 2. Respiration
- glucose + oxygen -> CO2 + H2O
- animals respire, carbon is released into atmosphere as CO2
- animals die + bodies broken down by decomposers, carbon is released into atmosphere as CO2
- 3. Combustion
- fossil fuel + oxygen -> CO2 + H20
- fossil fuels burnt to generate energy
- look at carbon cycle
- 1. photosynthesis
- 17.4 Rates of Decompostion
- temperature
- work faster in warm conditions
- too hot - enzymes denature
- moisture
- work faster in moist conditions
- easier to digest food
- work faster in moist conditions
- oxygen
- need oxygen to respire aerobically
- importance of decay in recycling
- compost, natural fertiliser, returning valuable minerals + improving soil structure
- compost can be made with or without oxygen - with oxygen quicker
- anaerobic respiration - produce biogas (methane). Can be produced in biogas generators
- provide a clean + renewable energy supply + reduce the volume of waste at landfill sites
- compost, natural fertiliser, returning valuable minerals + improving soil structure
- temperature
- 17.1 Feeding Relationships
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