4.3.1 Autotrophs convert Describe what is meant by carbon ‘fixation’ carbon dioxide into carbohydrates and other carbon compounds. 4.3.2 In aquatic habitats carbon dioxide is present as a dissolved gas and hydrogen carbonate ions. 4.3.3 Carbon dioxide diffuses from the atmosphere or water into autotrophs. 4.3.4 Carbon dioxide is produced by respiration and diffuses out of organisms into water or the atmosphere. 4.3.5 Methane is produced What is methanogenesis? from organic matter in anaerobic conditions by methanogenic archaeans Outline the types of anaerobic organisms that produce methane: and some diffuses into the atmosphere. 4.3.6 Methane is oxidized to carbon dioxide and water in the atmosphere. 4.3.7 Peat forms when Describe what peat is and how it forms: organic matter is not fully decomposed because of anaerobic conditions in waterlogged soils. 4.3.8 Partially decomposed Describe the formation of coal: organic matter from past geological eras was converted into oil and gas in porous rocks or into coal. Describe the formation of oil and natural gas: 4.3.9 Carbon dioxide is What occurs in combustion? produced by the combustion of biomass and fossilized organic matter. Give examples of natural and human-caused combustion of organic matter:
4.3.1 Autotrophs convert carbon dioxide into carbohydrates and other carbon compounds. 4.3.2 In aquatic habitats carbon dioxide is present as a dissolved gas and hydrogen carbonate ions. 4.3.3 Carbon dioxide diffuses from the atmosphere or water into autotrophs. 4.3.4 Carbon dioxide is produced by respiration and diffuses out of organisms into water or the atmosphere. 4.3.5 Methane is produced from organic matter in anaerobic conditions by methanogenic archaeans and some diffuses into the atmosphere. 4.3.6 Methane is oxidized to carbon dioxide and water in the atmosphere. 4.3.7 Peat forms when organic matter is not fully decomposed because of anaerobic conditions in waterlogged soils. 4.3.8 Partially decomposed organic matter from past geological eras was converted into oil and gas in porous rocks or into coal. 4.3.9 Carbon dioxide is produced by the combustion of biomass and fossilized organic matter. Describe what is meant by carbon ‘fixation’ What is methanogenesis? Outline the types of anaerobic organisms that produce methane: Describe what peat is and how it forms: Describe the formation of coal: Describe the formation of oil and natural gas: What occurs in combustion? Give examples of natural and human-caused combustion of organic matter:
4-150807021511-lva1-app6892.docx