Topic 4.3 Carbon Cycling Understandings Knowledge Preview

Rate your knowledge or skill level for each of these assessment statements or sub-topics for Topic 5.2. A 5 indicates mastery of the topic with respect to IB level questioning.
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  1. Autotrophs convert carbon dioxide into carbohydrates and other carbon compounds.
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  1. In aquatic ecosystems carbon is present as dissolved carbon dioxide and hydrogen carbonate ions.
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  1. Carbon dioxide diffuses from the atmosphere or water into autotrophs.
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  1. Carbon dioxide is produced by respiration and diffuses out of organisms into water or the atmosphere.
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  1. Methane is produced from organic matter in anaerobic conditions by methanogenic archaeans and some diffuses into the atmosphere or accumulates in the ground.
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  1. Methane is oxidized to carbon dioxide and water in the atmosphere.
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  1. Peat forms when organic matter is not fully decomposed because of acidic and/or anaerobic conditions in waterlogged soils.
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  1. Partially decomposed organic matter from past geological eras was converted either into coal or into oil and gas that accumulate in porous rocks.
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  1. Carbon dioxide is produced by the combustion of biomass and fossilized organic matter.
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  1. Animals such as reef-building corals and molluscs have hard parts that are composed of calcium carbonate and can become fossilized in limestone.
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Linda Kilch