In which form is nitrogen taken up by non-leguminous plants (that do not contain nitrogen-fixing bacteria)?

In which form do animals gain nitrogen when they feed on plants (ingestion)?

The diagram below shows part of the nitrogen cycle.

Which of the numbered stages involve bacteria?

The diagram below shows part of the nitrogen cycle.

Which stage is decomposition?

Which reaction shown below is carried out by denitrifying bacteria?

Bacteria such as Rhizobium convert nitrogen gas from the air into ammonia. What is the name of the group of bacteria which do this?

The diagram below shows part of the nitrogen cycle.

Which stage is nitrification?

Which kind of organisms are decomposers?

Why do decomposers break down plant and animal waste products?

Which conditions are best for the decomposition (the break down) of animal waste and dead plants/animal to happen quickly?

What do nitrogen-fixing bacteria do?

What do nitrifying bacteria do?

Which substances contain nitrogen?

About what percentage of the air is nitrogen?

Which type of plants have root nodules that contain nitrogen-fixing bacteria such as Rhizobium?

Atmospheric nitrogen (N₂) is easily taken up and used by plants and animals

Legumes host (have) nitrogen-fixing bacteria in their root nodules which convert nitrogen gas into ammonia that can be used by the plant to make amino acids.

How can nitrogen gas be removed from the atmosphere?

Nitrogen fixation is the conversion of..

Conversion of nitrate ions (NO₃^-) to nitrogen gas (N₂) is called..

The conversion of ammonium ions (NH₄^-) & ammonia (NH₃) ----into----> nitrites ----into------> nitrate ions is called?

Ammonification is formation of...

Rhizobium are an example of what type of bacteria?

When lightning strikes it can combine nitrogen and oxygen at high temperatures to form ____________?

These will be washed into the soil by rain where they will form nitrates.

Where can nitrogen fixing bacteria be found?

(Tick all that apply)

The breakdown of excess amino acids produces ammonia.

This can then combine with carbon dioxide to form urea (in animal urine).

This process involving the break down of excess amino acids is called...?

When nitrate ions are washed OUT of the soil by rainwater before the plants can absorb them this is known as?

What do farmers do in order to increase the amount of nitrate in the soil after it is absorbed by plants?

Tick those that apply