What are the whiplike tails found in one-celled organisms that aid in movement called?

The whiplike tails that aid in movement in one-celled organisms are called flagella. These structures are long, slender projections that propel the cell through liquid environments. Flagella function by rotating or undulating, allowing the organism to swim efficiently. They are particularly important in many types of protists and bacteria, enabling them to navigate their aquatic environments in search of nutrients or to avoid predators.

Cilia, while also involved in movement, are shorter and more numerous than flagella. They may cover the entire surface of some cells, creating waves that help in locomotion or moving fluid around the cell. Pseudopodia refer to temporary protrusions of the cell body, commonly seen in amoebas, used for movement and engulfing food. Axopodia are slender, temporary extensions of the cytoplasm used in some protists for capturing food and do not primarily function in movement like flagella do. Thus, the specific terminology of flagella accurately describes these specialized structures for movement in one-celled organisms.