Stages of the carbon cycle (19) Flashcards

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1
Q

what are the stages of the carbon cycle

A
  1. combustion
  2. respiration
  3. photosynthesis
  4. decay
  5. fossilisation
  6. ingestion
  7. assimilation
  8. egestion
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2
Q

combustion

A

stage 1 - burning
- increases CO2
- fossil fuels (coal, oil, petrol)

fuel + oxygen -> carbon dioxide + water

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3
Q

respiration

A

stage 2 - increases CO2
- animal, plants, fungi

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4
Q

photosynthesis

A

stage 3 - decreases CO2
- plants (+ algae)

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5
Q

decay

A

stage 4 - increases CO2 due to decomposers respiring

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6
Q

fossilisation

A

stage 5 - dead organic material that does not decay

dead organic material ——> fossil fuels

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7
Q

ingestion

A

stage 6 - eating a starch / fat meal

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8
Q

assimilation

A

stage 7 - uptake and use of glucose by body cells

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9
Q

egestion

A

stage 8 - removal from the body of undigested food (fibre = cellulose)

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10
Q

Summary of carbon cycle

A
  • carbon is found in the atmosphere as carbon dioxide
  • carbon in fixed into complex organic. compounds by plants during photosynthesis
  • carbon in producers is passed onto consumers by feeding
  • carbon is passed up the trophic levels of the food chain by ingestion
  • when producers or consumers die or animals excrete organic waste, the complex molecules are decayed by the decomposers: fungi and bacteria
  • decomposers are saprophytic feeders so they externally digest food
  • producers, consumers and decomposers release co2 into the air during respiration
  • if dead organisms or detritus are under extreme temp. or pressure, decay does not occur
  • organic compounds converted into fossil fuels during fossilisation
  • when fuels are combusted, they release methane
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