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Explanation : Flagella are microscopic hair-like structures. This is involved in the locomotion of the cell. The word flagellum means to whip. In a few organisms, flagellum is used as sensory organs that can sense changes in pH and temperature. Flagella are organelles are defined by function. Three types of flagella are distinguished. Like bacterial, archaeal, and eukaryotic. All these three kinds of flagella can be used for swimming. Archaeal flagella are nonhomologous flagella and bacteria flagella are a coiled thread-like structure. There are many functions of flagella. The flagella help an organism to move from one place to the other. In some organisms they act as sensory organs which detect temperature and pH changes. And some eukaryotes use flagellum to increase reproduction rates. Now it is also discovered that flagella are also used as a secretory organelle. Flagella are a protozoan's characteristic feature. Flagella is seen in different organelle as different structure, mechanism, movement and function.