OCR 21st Century, Biology B7.1 Higher tier. 3.5 / 5 based on 2 ratings ? BiologyGCSEOCR Created by: HannahCreated on: 07-12-11 21:08 Autotrophs and Heterotrophs Autotrophs- Produce their own food. GAIN ENERGY from the sun and making food. LOSE ENERGY because not all energy is absorbed. EG. Bacteria or Plants Heterotrophs-Eat other organisms. GAIN ENERGY from other organisms. LOSE ENERGY through movement and respiration. EG. Fox or cat 1 of 5 Food Chains Arrows indicate where the energy goes. Only 10% of energy is passed on to the next stage. Energy is lost at each stage because of Movement and Faeces. CALCULATE EFFICIENCY- USEFUL ENERGY OUT/ENERGY IN X 100 2 of 5 Soil SOIL; Biomass (Living organisms, worms and fungi) Inorganic materials (rocks) Air Water ( helps animals and plants grow) 3 of 5 Soil calculations WATER MASS- wet mass - dry mass WATER CONTENT% water mass/wet mass x 100% BIOMASS- wet mass- oven dry mass BIOMASS%- biomass/wet mass x 100% 4 of 5 Photosynthesis Carbon Dioxide + Water -> Glucose + Oxygen 6CO2 + 6H2O -> C6H12O6 + 6O2 Glucose produced is used for energy through respiration, stored as starch. Any temperature over 30 will decrease the rate of photosynthesis 5 of 5
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