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Feversham College



Nutrient
Cycles
AQA Unit 4 Biology
Frihah Parvaiz
z

Page 3

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Page 4

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Nutrient cycles The role of microorganisms in the carbon and nitrogen cycles in sufficient detail to
illustrate the processes of saprobiotic nutrition, ammonification, nitrification, nitrogen fixation and
denitrification. (The names of individual species are not required.)
Basic Sequence of all nutrient cycles

1

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Ammonification
Nitrogen compounds from dead organisms (faeces) are turned into
ammonium compounds by decomposers
Nitrogen Fixation
Its when N
2

gas in the air is converted into ammonia by bacteria The ammonia is used
by plants The relationship is mutualistic- they give the plants nitrogen
compounds and the plants give…

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The importance of respiration, photosynthesis and human activity in giving rise to short term fluctuations
and long term change in global carbon dioxide concentration
Variations in the rates of respiration and photosynthesis give rise to short-term fluctuations in
CO
2

in the atmosphere. The CO
2

concentration at night is…

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
Feversham College



Nutrient
Cycles
AQA Unit 4 Biology
Frihah Parvaiz
z

Page 3

Preview of page 3

Page 4

Preview of page 4
Nutrient cycles The role of microorganisms in the carbon and nitrogen cycles in sufficient detail to
illustrate the processes of saprobiotic nutrition, ammonification, nitrification, nitrogen fixation and
denitrification. (The names of individual species are not required.)
Basic Sequence of all nutrient cycles

1

Page 5

Preview of page 5

Page 6

Preview of page 6
Ammonification
Nitrogen compounds from dead organisms (faeces) are turned into
ammonium compounds by decomposers
Nitrogen Fixation
Its when N
2

gas in the air is converted into ammonia by bacteria The ammonia is used
by plants The relationship is mutualistic- they give the plants nitrogen
compounds and the plants give…

Page 7

Preview of page 7

Page 8

Preview of page 8
The importance of respiration, photosynthesis and human activity in giving rise to short term fluctuations
and long term change in global carbon dioxide concentration
Variations in the rates of respiration and photosynthesis give rise to short-term fluctuations in
CO
2

in the atmosphere. The CO
2

concentration at night is…

Page 9

Preview of page 9

Comments

No comments have yet been made