NEET BIOLOGY

Detailed explanation-1: -A flagellum (Latin for whip) is a lash-like appendage that protrudes from the cell body of some protists (as well as some bacteria). Flagellates use from one to several flagella for locomotion and sometimes as feeding and sensory organelle.

Detailed explanation-2: -Flagella-rotating whip-like structures driven by reversible motors-rotate in a counterclockwise direction to propel the bacterial cell in a swimming motion called “running”. When at least one flagellum moves in a clockwise direction, the cell begins to “tumble”, changing its directional course.

Detailed explanation-3: -Zooflagellates are a third type of protists. They are animal-like and move by using flagella. Flagella are whip-like structures that spin quickly, working like a boat’s propeller to move the organism through water. Most zooflagellates have from one to eight flagella that help them move.

Detailed explanation-4: -Many protists take the form of single-celled flagellates. Flagella are generally used for propulsion. They may also be used to create a current that brings in food. In most such organisms, one or more flagella are located at or near the anterior of the cell, e.g., Euglena.

Detailed explanation-5: -(c) Euglena uses a whip-like tail called a flagellum to propel itself. Some protists can move toward or away from a stimulus, a movement referred to as taxis. For example, movement toward light, termed phototaxis, is accomplished by coupling their locomotion strategy with a light-sensing organ.