The presence of cluster polar flagella is termed as
A.Monotrichous
B.Amphitrichous
C.Lophotrichous
D.Peritrichous

Hint: Bacteria are prokaryotic microscopic microorganisms that have a few micrometers of length, spherical or rod like in shape. Bacteria have flagella that helps them in their locomotion and movement. Bacteria are classified according to the presence of flagella, or the source of food they intake, the mechanism by which they make food, the temperature they can survive etc.

Complete step by step answer:
There are four types of bacteria that are classified according to the presence of flagella. Those are as follows:
Monotrichous – presence of single polar flagellum. For example – Vibrio cholerae
Amphitrichous – presence of single flagellum on both sides of the body of the bacterium. For example – Alkaligens faecalis
Lophotrichous – presence of cluster of polar flagella at one end or both ends of the body of bacterium. For example – Spirillum sp.
Peritrichous – presence of numerous flagella all over the body of the bacterium. For example – Salmonella typhi
There is another type – atrocious that can be described as a type of bacteria where no polar flagella is present.

Hence, the correct answer is option C. Lophotrichous.


          Fig: Bacteria and its classification according to flagella

Note:
Bacterial flagella are made up of flagellin protein and are helical in structure. The base of the flagella is known as the hook which is present near the cell surface. It is attached to the basal body and is enclosed in the envelope of the cell. The flagella spin in a clockwise or anticlockwise manner just like a propeller.