Chapter 18, Problem 9A

Summary Introduction

Introduction:

The bacteria are the microscopic organism. They are prokaryotic and they lack true nucleus. On the basis of morphology, they can be divided into three type: spirochetes, cocci and bacilli.

Answer to Problem 9A

Option (B).

Explanation of Solution

Explanation for correct answer:

Option (B) I-bacilli, II- cocci, and III-spirochetes.

The first pictures represent a rod-shaped bacteria, which are present independently. They are elongated in appearance. These bacteria are called bacilli.

The second image shows a round shaped bacteria. They are look like spherical balls under microscopes and are known as cocci.

The third image shows long bacteria, which are arranges in a helix or a spring like pattern. Their resemblance to the spiral shape .

Explanation for incorrect answer:

Option (A) I-Cocci, II-bacilli, and III-spirochete. The first picture shows rod shaped bacteria; hence, it is bacilli. Hence, this is an incorrect answer.

Option (C) I-spirochete, II-cocci, and III-bacilli. The first picture shows rod shaped bacteria; hence, it is bacilli. The third picture show spiral shaped bacteria; hence, it is spirochete. Hence, this is an incorrect answer.

Option (D) I-bacilli, II-spirochete, and III-cocci. The second picture shows sphere shaped bacteria; hence, it is cocci. The third picture show spiral shaped bacteria; hence, it is spirochete. So, this is an incorrect answer.