#. Microorganisms are classified as algae, fungi, bacteria, protozoans. Though viruses are microbes but not included in this group because they are considered as nonliving entities. Here , we can discuss viruses also. | #. Microorganisms are classified as algae, fungi, bacteria, protozoans. Though viruses are microbes but not included in this group because they are considered as nonliving entities. Here , we can discuss viruses also. |