carbon cycle

AQA GCSE BIOLOGY

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The carbon cycle shows how carbon is recycled
-Carbon dioxide is taken in by plants in order to carry out
photosynthesis and make food.
-The carbon from the carbon dioxide is used to make
carbohydrates, fats and proteins that make up the plant
body. For example the cell wall of plants is made from
cellulose - a carbohydrate.
-Some of this carbon is returned into the atmosphere as
carbon dioxide when the plant respires. When these plants
are eaten by other animals this carbon becomes part of the
proteins and the fats that make up their bodies.
-When these animals respire some of this carbon becomes
carbon dioxide and is released back into the atmosphere.
-When plants and animals die micro-organisms feed on their
body. In order to do so these micro-organisms have to
respire to produce energy. As a result they give out carbon
dioxide as they respire
-Also the combustion of fossil fuels releases carbon dioxide
back into the atmosphere as they contain locked up carbon
compounds.
You could be asked for the equation for photosynthesis:
Carbon Dioxide + Water ------> Glucose + Oxygen
OR the equation (balanced) for respiration
Glucose + Oxygen ------> Carbon dioxide + water + energy
c6h12o2 + 6o2 -------> 6co2 + 6H20 + energy
ALSO why is more carbon dioxide been given out to the
atmosphere than taken in?

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As a result of deforestation less carbon dioxide is being
taken in by plants for photosynthesis for food. Also due to
the combustion of fossil fuels more and more carbon dioxide
as given out and there are less trees available to remove
this from the atmosphere due to deforestation.…read more

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