Zusammenfassung der Ressource
GCSE AQA Biology 1 Energy Transfer, Decay and The Carbon Cycle
- Pyramids of Biomass
- Biomass: Mass
of living material
- Less energy/biomass as
you go up trophic levels
- Mostly pyramid-shaped
- Producer at the bottom
- Energy Transfer
- Energy from Sun -
source of energy for life
Anmerkungen:
- Light energy converted to chemical energy
- Green plants use small % of light in photosynthesis
- Energy stored in cells - animals eat them
- Respiration supplies energy for movement
- Energy lost to surroundings as heat
Anmerkungen:
- Especially in mammals and birds - have to keep body at constant temp.
- Some material is inedible
and some is lost as waste
- Hardly any food chains
more than 5 levels
Anmerkungen:
- Because so much energy is lost. Therefore, there is not enough left to support more organisms
- Decay
- Plants take in elements and pass through food chain
Anmerkungen:
- Like carbon, oxygen, hydrogen and nitrogen
- Elements returned in waste products or when they die
- Materials decay - broken down by microorganisms
Anmerkungen:
- Microorganisms work best in warm
& moist conditions with oxygen
- Composting
- Benefits
- Recycles minerals & nutrients
- Reduces landfill
- Reduces production of methane
- The Carbon Cycle
- Only 1 arrow coming down - photosynthesis
Anmerkungen:
- Carbon dioxide is removed from atmosphere by green plants, some of the carbon is used to make carbohydrates, fats and proteins in the plants
- Some carbon returned as
carbon dioxide - respiration
Anmerkungen:
- Some carbon moves through food chain to animals
- When plants/animals die, detritus feeders
and microorganisms feed on remains
- These organisms respire
- Animals produce waste
Anmerkungen:
- Broken down by detritus feeders and microorganisms
- Useful plant/animal products are burnt (combustion) - releasing carbon dioxide