Cycles within ecosystems

The diagram shows the nitrogen cycle with processes labelled $A$ , $B$ , $C$ , $D$ , and $E$ .

A schematic diagram of the nitrogen cycle.

Name the process labelled $C$ .

[1]

Give the letter of the process that converts nitrogen gas from the atmosphere into nitrogen compounds in the soil.

[1]

Many aquatic habitats are affected by human activities that release excess nutrients.

Suggest two human activities that can increase the concentration of nitrates in aquatic ecosystems.

[2]

Describe the consequences of an increase in nitrate concentration for these aquatic ecosystems.

[6]

Cycles within ecosystems Questions