What are protozoa?

What are protozoa?

• A. Multicellular organisms
• B. Bacteria-like organisms
• C. Single-celled organisms
• D. Fungi

Answer: (C)

Protozoa are single-celled, eukaryotic microorganisms. Each organism carries all life processes within one cell, unlike multicellular organisms that rely on many cells. They are distinct from bacteria, which are prokaryotes lacking a defined nucleus, and from fungi, which form their own kingdom with different cell walls and nutritional modes. Protozoa are typically microscopic and move via pseudopods, cilia, or flagella, with examples like Amoeba, Paramecium, and Giardia illustrating the range of single-cell forms. This single-cell nature is the key trait that defines protozoa.

Protozoa are single-celled, eukaryotic microorganisms. Each organism carries all life processes within one cell, unlike multicellular organisms that rely on many cells. They are distinct from bacteria, which are prokaryotes lacking a defined nucleus, and from fungi, which form their own kingdom with different cell walls and nutritional modes. Protozoa are typically microscopic and move via pseudopods, cilia, or flagella, with examples like Amoeba, Paramecium, and Giardia illustrating the range of single-cell forms. This single-cell nature is the key trait that defines protozoa.