What is the primary function of cilia in certain bacteria?

Cilia play a vital role in the locomotion of certain bacteria, acting as hair-like structures that help propel the cell through its environment. These tiny appendages beat in a coordinated manner, enabling the organism to move effectively, which is crucial for seeking out nutrients, escaping harmful substances, and navigating different environments. This mode of movement is particularly important for bacteria that may need to be mobile for survival or colonization.

Reproduction, nutrient storage, and structural support are functions associated with other cellular components rather than cilia. Therefore, the primary function of cilia in certain bacteria is indeed to facilitate locomotion, ensuring these microorganisms can thrive in varied conditions.