Protozoa commonly exhibit which feature?

• A. They are photosynthetic
• B. They are typically motile
• C. They form multicellular tissues
• D. They lack a nucleus

Answer: (B)

Movement through the environment is a defining feature of protozoa. As single-celled eukaryotes, they are typically motile, using structures like flagella, cilia, or pseudopodia to swim, glide, or crawl in search of nutrients. This motility supports their heterotrophic lifestyle, helping them locate bacteria and other prey. While some protozoa can have chloroplasts or photosynthesize, that’s not a universal trait, so being photosynthetic isn’t the best general descriptor. Protozoa do not form true multicellular tissues—they are primarily single cells, even if they can form colonies or transient aggregations. They also possess a nucleus, so lacking a nucleus wouldn’t apply. Thus, being typically motile best captures the common characteristic of protozoa.