Organisms that live on non-living organic matter and release enzymes to absorb nutrients. (Trophs: links with feeding.)
1 of 12
3 steps in saprotrophic feeding?
1). Saprotrophs secrete enzymes onto dead + waste material 2). Enzymes digest the material into small molecules which are then absorbed into the saprotroph’s body. 3). The molecules are stored or respired to release energy
2 of 12
What do plants use nitrogen for?
• Synthesising DNA + RNA • Nucleotide found in nitrogenous base • Nitrogen needed to form amino acids which is essential to make proteins (more growth)
3 of 12
Give 3 ways nitrogen in the air is fixed?
1). Lightning, 2).The Haber process, 3). Nitrogen-fixing bacteria
4 of 12
Name the nitrogen-fixing bacteria found free-living in the soil?
Azotobacter
5 of 12
Name the nitrogen-fixing bacteria found in the root nodules of leguminous plants?
Rhizobium
6 of 12
What is the role of leghaemoglobin in root nodules?
Keep conditions anaerobic
7 of 12
What is the name of the enzyme used to reduce nitrogen gas to ammonium ions?
Nitrogen reductase
8 of 12
What is ammonification?
The release of ammonium ions by bacteria involved in the putrefaction of proteins found in dead or waste organic matter
9 of 12
Name the process which causes the oxidation of ammonium to nitrite and nitrite to nitrate?
Nitrification
10 of 12
Name the bacteria that oxidises ammonium ions to nitrites
Nitrosomonas
11 of 12
Name the bacteria that oxidises nitrites to nitrates
Nitrobacter
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Other cards in this set
Card 2
Front
3 steps in saprotrophic feeding?
Back
1). Saprotrophs secrete enzymes onto dead + waste material 2). Enzymes digest the material into small molecules which are then absorbed into the saprotroph’s body. 3). The molecules are stored or respired to release energy
Card 3
Front
What do plants use nitrogen for?
Back
Card 4
Front
Give 3 ways nitrogen in the air is fixed?
Back
Card 5
Front
Name the nitrogen-fixing bacteria found free-living in the soil?
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