Carbon and Nitrogen Cycle Mixed Facts 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelAQA Created by: Jasmine KhatriCreated on: 17-11-15 15:30 How do plants take in Carbon Dioxide? Photosynthesis. 1 of 11 How is carbon dioxide transferred to 1st, 2nd ... consumers? Through eating. Carbon compounds are assimilated into each organism. 2 of 11 What happens when living organisms die? Their remain are broken down by decomposers. This is called saprobiotic nutrition. 3 of 11 How is carbon dioxide returned to the atmosphere? Through respiration via plants, animals and decomposers. Additionally through burning of fossil fuels where no decomposers were present. 4 of 11 Why are carbon dioxide levels low during the day? Photosynthesis occurs during the day which removes carbon dioxide from the air. 5 of 11 What about on a summers day? Greater light intensity = more photosynthesis = more carbon dioxide removed. 6 of 11 What happens to nitrogen in the air? It is fixed to either ammonium ions by free-living bacateria or to ammonium compounds by mutualistic bacteria on legumes. 7 of 11 What happens to the ammonium ions? Nitrification oxidises them to nitrite and then nitrate ions which are then absorbed into plants or denitrifiyed to nitrogen gas. 8 of 11 What happens to the ammonium compounds in plants? They are eaten by animals so ammonium compounds assimilate there. 9 of 11 What happens upon the death of plants and animals? Decomposers break down the corpses and assimilate the ammonium compounds. 10 of 11 What happens during ammonification? The ammonium compounds assimilated by decomposers and transformed to ammonium ions. 11 of 11
OCR F215 Control, Genomes and the Environment revision PPT. 5.0 / 5 based on 1 rating Teacher recommended
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