Question

Which of the following has peritrichous flagella?
A. Pseudomonas
B. Bacillus typhosus
C. Spirillum
D. Vibrio

Answer 1

Hint: Flagella are the small outgrowths that are present on the membrane. They are hair like structures.
Flagella are long that helps in cell movement. Flagella are found both in prokaryotes that is monerans. Monera is the kingdom of bacteria and also present in eukaryotes.

Complete answer: Peritrichous flagella: when flagella is present all over the body surface that is in all directions it is termed as peritrichous flagella. Bacteria which possess flagella all over its body are termed as peritrichous bacteria. It causes movement of bacteria in every possible direction.
Now let us see which bacteria has peritrichous flagella:-
Pseudomonas :- they have amphitrichous type of flagella . The flagella may be single or multiple and it extends from the two ends of the cell . Thus this option is not correct.
Bacillus typhosus :- they have flagella all over the surface of the body. They possess flagella in every direction . So they are termed as peritrichous bacteria.
Spirillum :- they have lophotrichous flagella . The flagella is present in the form of tuft and it may be extended from one end of the cell or both the ends of the cell.
Vibrio :- it has monotrichous flagella . As the name suggests it has a single flagella which extends from one end of the cell.

Our required answer is B) Bacillus typhosus.

Note: Flagella are membrane bound extensions of the plasma membrane. They arise from centriole.The number of flagella per cell is usually 1-4. They are longer in size. Flagella are commonly found at one end of the cell. Flagella helps in locomotion.