ecosystems rely on energy transfer
- Created by: rima
- Created on: 13-03-14 20:40
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- ecosystems rely on energy transfer
- Producers and productivity
- primary productivity
- the rate at which energy is incorporated into organic molecules in an ecosystem
- producers (autotrophs)
- make their own organic molecules from inorganic molecules
- e.g plants, algae and bacteria
- primary productivity
- photosynthesis
- light dependent reactions
- light absorbed by chloryphyl
- light raises two electrons in the chlorophyl
- electrons leave the excited chlorophyl
- the electrons pass along the electron carrier molecules in an electron transport chain
- energy lost from the electrons are used for ATP synthesis
- photo phosphorylation
- photolysis is where an enzyme splits water into:
- hydrogen ions
- electrons
- oxygen gas
- reduced NADP is formed from hydrogen ions and electrons
- light independent reactions
- calvin cycle
- co2 combines with 5 carbon compound
- 6 carbon compound breaks to 2 3 carbon compounds
- 3 carbon compound is reduced to GALP
- hydrogen is used for reduction
- energy from ATP is used
- some GALP is used to create carbohydrates
- most of GALP are used to recreate RuBP
- takes place in the stroma
- ATP and NADP is used
- calvin cycle
- light dependent reactions
- Transfer of energy through an ecosystem
- autotrophs
- also known as producers
- Hetrotrophs
- primary consumers
- Herbivores
- Detritivores
- feed on dead organic matter
- secondary consumers
- Carnivores
- Tertiary consumers
- top carnivores
- Decomposers
- feed on dead remains of organisms
- primary consumers
- energy transferred from producers to consumers
- food chain
- feeding relationships
- trophic level
- position a species occupies
- food web
- more complex feeding relationships
- food chain
- How efficient is the energy transfer
- limiting factors
- GPP - gross primary productivity
- the rate at which energy is incorporated into organic molecules by an ecosystem
- NPP - net primary productivity
- the rate at which energy is transferred into organic molecules that make up the new plant biomass
- NPP = GPP - R
- Disappearing energy
- producers to primary consumers
- not all available food gets eaten
- some energy is lost in faeces and urine
- much energy is used in respiration
- primary consumers to secondary consumers
- is more efficient
- producers to primary consumers
- autotrophs
- Producers and productivity
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