4.9 Carbon Cycle

4.9 Carbon Cycle

Describe the stages in the carbon cycle, including respiration, photosynthesis, decomposition and combustion

1) Photosynthesis -

Carbon dioxide comes from the atmosphere (0.03%)

When photosynthesis occurs it reduces the atmospheric Carbon dioxide

2) Feeding - Producer - Primary consumer (takes in carbon from the producer and reconstitute body material for growth) - Secondary consumer (carbon passes along the food chain). All levels in the food chain respire emitting carbon dioxide into the atmosphere.

3) Respiration - (for each stage in the food chain, each organism carries out the process of respiration)

(Begins with organic molecules; glucose). The process releases energy which is used for growth and movement. It also produces Carbon dioxide and water. Respiration adds carbon dioxide to the atmosphere.

4) Decomposition - All of the organisms in the food chain eventually die. The organic molecules are broken down by decomposer organisms known as bacteria and fungi. This causes the release of Carbon dioxide into the atmosphere as well.

5) Combustion -

1. Fossil fuels (formed millions of years ago due to the compression of plants and animals forming coal, oil and natural gas) are combusted to produce carbon dioxide. E.g. Industrial/motor (cars, aeroplanes, Lorries all combust fuels)

2. Environment- lightning striking vegetation causing forest fires causing carbon dioxide to get released into the atmosphere