Carbon cycle quiz 4.3

Carbon dioxide is converted by photosynthesis in autotrophs.

Which type of compound are made using the carbon dioxide?

Photosynthesis uses carbon dioxide to make carbohydrates - using water molecules as well.

 

Carbon is present as dissolved molecules in aquatic ecosystems, shown in the diagram below.

Which two molecules are most commonly refered to in statements about dissolved aquatic carbon in these systems?

The two molecules mentioned in the syllabus  in reference to dissolved carbon are carbon dioxide and bicarbonate (hydregen carbonate)

 

By what process does Carbon dioxide move from the atmosphere or water into autotrophs.

Carbon dioxide moves by diffusion.

 

Carbon dioxide diffuses out of organisms into water, or the atmosphere.  What is the process which produces the carbon dioxide?

Carbon dioxide is produced by respiration.  Decarboxylation reactions can produce carbon dioxide, but not carboxylation.

 

Methane (CH4) is produced as part of the carbon cycle.  Which process is involved?

Methane is produced from decaying organic matter in anaerobic conditions by bacteria

 

Methane is changed by chemical reactions in the atmosphere.  What does the methane change into?

Methane is oxidized to carbon dioxide and water in the atmosphere.

 

How does "Peat" form in the ground in some parts of the world?

Peat forms when organic matter is not fully decomposed in waterlogged soils.

 

Which of the processes listed produce carbon dioxide?

Carbon dioxide is produced by the combustion of biomass and fossil fuels.

 

Animals such as reef-building corals and mollusca form a resevoir in the carbon cycle.  In what form is the carbon stored as in their bodies?

Animals such as reef-building corals and mollusca have hard parts that are composed of calcium carbonate (CaCO3)and can become fossilized in limestone

 

How precise are measurements of carbon fluxes?

Carbon flux figues are always estimates.

 

Which organism is most likely to produce methane in the carbon cycle?

Methane is produced from decaying organic matter in anaerobic conditions by bacteria

 

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