Single-celled microscopic animals without a rigid cell wall are known as

Single-celled microscopic animals without a rigid cell wall are known as

• A. Protozoa
• B. Bacteria
• C. Algae
• D. Fungi

Answer: (A)

Protozoa are single-celled microscopic animals that lack a rigid cell wall. This flexible boundary allows them to move and feed like animals, using structures such as cilia, flagella, or pseudopods to swim and engulf prey. They are eukaryotes, distinct from bacteria, which are typically prokaryotic and have rigid cell walls, and from algae, which are photosynthetic and contain chloroplasts, as well as from fungi, which usually have chitin-containing walls. Examples like Amoeba and Paramecium illustrate the animal-like, motile, and ingestive nature of protozoa.

Protozoa are single-celled microscopic animals that lack a rigid cell wall. This flexible boundary allows them to move and feed like animals, using structures such as cilia, flagella, or pseudopods to swim and engulf prey. They are eukaryotes, distinct from bacteria, which are typically prokaryotic and have rigid cell walls, and from algae, which are photosynthetic and contain chloroplasts, as well as from fungi, which usually have chitin-containing walls. Examples like Amoeba and Paramecium illustrate the animal-like, motile, and ingestive nature of protozoa.