Flagella are the hair-like structures which act as organelles of locomotion in which of the following organisms?

Bacteria

The correct answer is Option (2) – Bacteria

Flagella are the hair-like structures which act as organelles of locomotion in Bacteria.

Explanation:

• Flagella are whip-like appendages that protrude from the surface of certain cells and are used for locomotion.
• In bacteria, flagella are long, helical structures composed of proteins and rotate like propellers to propel the bacterial cell forward.
• Amoeba moves by pseudopodia, Paramecium moves using cilia, and viruses lack cellular structures for independent movement.