Question

Differences between protozoa and metazoa

Answer 1

• Protozoa
• They are single celled organisms that are not an animal, plant, bacteria or fungi
• A single cell performs all functions; therefore there is no division of You do not have access to view this node.
• They have a cellular grade of organization, e.g. Amoeba paramecium.
• Protozoans are always motile, as there are no protozoans that can survive by stationary filter-feeding, in contrast to the numerous animals such as sponges, corals etc. Motility is a biological term which refers to the ability to move spontaneously and actively, consuming energy in the process. Filter feeding is a method of feeding where small food particles are filtered from the surrounding water by various mechanisms.
• Many unicellular organisms also arrange themselves into a thread like or spherical colonies such as cyanobacteria (often referred as “blue-green algae)or cholorphyte volvox.
• Protozoans range bigger from 10-50 microns (millionth of meter), just a few species are as large as 1mm.

​​Metazoa

• They are multi-cellular organisms.
• They show division as different cells or organs perform different functions.
• They have cellular You do not have access to view this node, organ and system grade of organization, e.g. Sponges to chordates.
• Metazoans include about 50 microns