Protozoans play important roles in the fertility of soils. By grazing on soil bacteria, they regulate bacterial populations and maintain them in a state of physiological youth—i.e., in the active growing phase.

How are protozoans important to the environment?

Protozoa. Protozoa play important roles in environmental food web dynamics. They graze on bacteria thus regulating bacterial populations, they part-take in wastewater treatment processes, they maintain fertility in soil by releasing nutrients when they digest bacteria.

What are the economic importance of protozoa?

These Protozoa play an important role in the sanitary betterment, improvement of water and keeping water safe for drinking purposes. Planktonic Protozoa as food: Protozoa floating on the plankton of sea provide directly or indirectly the source of food supplies to man, fish and other animals.