Energy and ecosystems
- Created by: SerenM
- Created on: 17-01-18 10:52
1) Explain the relationship between photosynthesis, respiration and biomass.
- Photosynthesis generates biomass
- CO2 uptaken -> calvin cycle -> organic molecules (glucose) produced
- Energy comes from light
- Respiration reduces biomass
- Loss of energy as heat
- Therefore reduction in biomass as you go up trophic levels
- Saprobiants recycle biomass -> break it down into smaller molecules (nitrates) which can e taken up by plants
2) Energy into ecosystems
- 1-3% of the suns energy is converted by plants into organic matter
- 90% of suns energy is reflected back and absorbed by atmosphere
- 7-9% --> Not all wavelengths of light are absorbed by plants, light might not hit a photosynthetic pigment, other factors might limit photosynthesis (CO2)
3) Energy through the food chain
- NPP is available for plant growth and reproduction
- 10% of NPP in plants is used by primary consumers for GROWTH
- Secondary + tertiary consumers transfer 20% of the energy from their prey into their bodies:(
4) Why are secondary/ tertiary consumers more efficient?
- You can eat more of animals than plants
- Some of the organism cant be digested - a lot cant…
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