Question | Answer |
What is a nitrogen cycle? | A process by which nitrogen is recycled between the air, plants, animals and the soil. |
Why is nitrogen important? | It is necessary to make protein. |
Name a stage that does not involve bacteria in the nitrogen cycle | eating/absoprtion |
What controls the nitrogen cycle? | Three types of bacteria |
What do nitrogen fixing bacteria do? | Convert nitrogen gas into protein |
Where are nitrogen fixing bacteria found? | In the soil OR root nodules |
What do denitrifying bacteria do? | convert nitrate into nitrogen gas/air |
Which part of the nitrogen cycle does not involve bacteria? | Animals eating plants (food chain) |
What substance are dead plants and animals broken down into? | Ammonia |
Organisms that break down dead animals/plants are | Decomposers |
Decomposers include | fungi and bacteria |
What do nitrifying bacteria do? | Convert ammonia into nitrite and then into nitrate |
Which is the only two step process in nitrogen cycle? | Nitrification |
What is absorption | Plants take up nitrate by their roots and use it to make protein |