Question

Bacteria with a group of flagella on both sides are
A. Amphitrichous
B. Cephalotrichous
C. Peritrichous
D. Lophotrichous

Answer 1

Hint:- There are five types of flagellar arrangements and the flagella in these arrangements are arranged on the basis of number and the arrangement is on the basis of flagella placement.

Complete step-by-step solution:-
All the options given in the question are flagellar arrangements which are based upon the number and the placement of flagella on the cells and there are five types of flagellar arrangements as shown in the diagram. These are-
-Monotrichous: This is a type of flagellar arrangement where a single flagellum extends from one end of the bacterial cell as shown in the diagram.
-Amphitrichous: This is a type of flagellar arrangement where a single flagella extends from both the ends of the bacterial cell as shown in the diagram.
-Lophotrichous: This is a type of flagellar arrangement where a bundle of flagella extends from one end of the bacterial cell as shown in the diagram where there is a tuft of flagella on one side.
-Peritrichous: This is a type of flagellar arrangement where there are multiple flagella which are randomly distributed over the entire bacterial cell except at the poles as shown in the diagram.
-Cephalotrichous: This is a type of flagellar arrangement where a group of flagella extends from both the ends of the bacterial cell.
If we look at the question now, that bacteria with a group of flagella on both sides is asked and a group of flagella which extends from both sides are seen in cephalotrichous and this is given in option B which makes option B the correct one.
Thus, the correct answer is option B which is Cephalotrichous.

Note:- Amphitrichous is an arrangement where a single flagella extends from both the sides, thus it is not the correct one and Peritrichous and Lophotrichous are also not correct because in these arrangements, bundles of flagella do not extend from both the sides. Bacteria with a group of flagella on both sides are Cephalotrichous.