Carbon & Nitrogen Cycles Flashcards Preview

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Flashcards in Carbon & Nitrogen Cycles Deck (12):
0

What does photosynthesis do in the carbon cycle

Fixes carbon atoms from carbon dioxide into organic compounds (eg. Glucose)

1

Feeding process in carbon cycle

Passes carbon atoms from organic compounds along food chains

2

Respiration process in carbon cycle

Produces inorganic carbon dioxide from organic compounds as these are broken down to release energy

3

What releases carbon from dead organic material during respiration?

Decomposers

4

What is formed when dead organic matter does not fully decay due to conditions in the soil?

Fossil fuels (through fossilisation)

5

Process by which plants get some of their nitrogen by absorption of nitrate ions via their roots

Assimilation

6

What is ammonification

Decomposition by decomposers of dead plant and animal material produces ammonia from organic compounds

7

What bacteria where is used in nitrogen fixation 2

Free-living nitrogen-fixing bacteria in soil
Symbiotic bacteria in root nodules

8

What happens in nitrogen fixation

Nitrogen from the air is fixed into ammonia which is then used by the bacteria or the symbiotic plant to make amino acids and proteins

9

What happens in denitrification

Denitrifying bacteria use nitrate in the soil and convert it back into nitrogen gas

10

2 human activities that have significant effects on the global cycling of carbon

Combustion of fossil fuels, which increases carbon dioxide levels
Deforestation also increases carbon dioxide levels

11

Why might there be faster decomposition of insects are allowed access to the dead bodies

Insects chew bodies into smaller pieces, providing a larger surface area for enzymes produced by decomposers