Chemical nutrients and mineral ions are vital for maintaining soil fertility and supporting plant growth within ecosystems.
Explain why phosphate ions are essential for healthy plant growth.
Name the biological process by which soil decomposers (saprobionts) convert nitrogen-containing organic compounds, such as proteins and urea, into ammonium ions.
Under aerobic conditions, such as in well-aerated soil, ammonium ions can be converted into a form that plants can easily absorb.
Describe how ammonium ions are converted into nitrates, including the specific type of bacteria involved.
The graph shows the effect of different temperatures on the rate of protease activity of a psychrophilic (cold-adapted) soil bacterium.
Explain the change in the rate of protease activity from 0∘C0^\circ\text{C}0∘C to 12∘C12^\circ\text{C}12∘C.
Explain the change in the rate of protease activity from 12∘C12^\circ\text{C}12∘C to 24∘C24^\circ\text{C}24∘C.
