Nitrogen cycle Flashcards
How is nitrogen gas in the atmosphere fixed into nitrogen compounds that can be used by organisms?
nitrogen fixation by lightning and nitrogen fixing bacteria - also by Humans in a process called the Haber process used to make artificial fertilisers.
Ammonium ions to nitrites
Nitrification
Nitrites to Nitrates
Nitrification
Nitrates to Nitrogen in the atmosphere
Denitrification
nitrates to producer
absorption
nitrogen in atmosphere to producer
nitrogen fixation
producer to consumer
feeding and digestion
producer and consumer to decomposer
death ( and excretion)
decomposer to ammonium ions in ground
decomposition
organisms involved in nitrogen fixation
nitrogen fixing bacteria
organisms involved in nitrification
nitrifying bacteria
organisms involved in denitrification
denitrifying bacteria
organisms involved in decomposition
decomposers
what benefits to leguminous plants of having root nodules containing nitrogen fixing bacteria
absorb more nitrogen and grow quicker
two examples leguminous plants
clover and peas
Which letter shows absorption of nitrates to make new nitrogen compounds for growth?
C
Which letter shows where ammonification occurs converting nitrogen containining biological molecules into ammonium ions?
B
Which letter shows denitrification?
D
Which letter shows natural processes that can fix nitrogen from the atmosphere?
A
How are nitrates used by plants for growth?
Soluble nitrates are absorbed by the roots and are assimilated to make amino acids. These then build proteins / enzymes which are necessary for growth.
What is assimilation?
The formation of organic nitrogen compounds like amino acids, DNA or ATP from nitrates
