OCR 21st Century, Biology B7.1

Higher tier.

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  • Created by: Hannah
  • Created 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

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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

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Soil

SOIL;
         Biomass (Living organisms, worms and fungi)
         Inorganic materials (rocks) 
         Air
         Water ( helps animals and plants grow)

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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%

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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

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