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#Biology #Phylum_Protozoa

INTRODUCTION:

All unicellular (or acellular) eukaryotic animals.
Most primitive (Gr. Porots = first + zoon = animal) organisms considered animals because of heterotrophic nutrition and motility.
Although the whole body is a single minute cell.
About 50,000 species (30,000 present and 20,000 extinct) are so far known.
It is 3rd largest phylum.

Salient Features/Characteristics:

Protozoans are the simple and primitive organisms
Body level of organisation of Protozons is Protoplasmic level.
Consists of uninucleate or multinucleate protoplasm mostly naked or some have body bounded by delicate membrane or a firm pellicle; Lorica or shell.
In few groups of protozoa CaCO3 & Silica shell's exoskeleton is found. Example: Radiolarian group & Foraminiferan group.
Number of nuclei varies from one to many. Few show nuclear dimorphism. Example: Paramoecium.
Body performs all necessary biological activity so in them sub cellular - Physiological division of labour is found.
All the free living forms are aquatic.
They are asymmetrical or radially symmetrical or bilaterally symmetrical.
They are unicellular (acellular).


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