Question

In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on

• A. 5th segment
• B. 10th segment
• C. 8th and 9th segment
• D. 11th segment

Answer 1

The Correct Option is B

The anal cerci of a cockroach are vital sensory appendages found at the rear of the abdomen. These paired structures, present in both sexes, detect vibrations and movements, facilitating rapid environmental responses like predator evasion. The anal cerci attach to the 10th abdominal segment.

A cockroach's body has three main parts: head, thorax, and abdomen. The abdomen is composed of 11 segments, counted from anterior to posterior, each with specific functions. The anal cerci are specifically located on the 10th abdominal segment. This position optimizes sensitivity to environmental cues, improving the cockroach's ability to react to ground vibrations and threats.

Therefore, in both male and female cockroaches, the anal cerci are situated on the 10th abdominal segment.

Segment	Structure
5th segment	Not applicable
8th and 9th segment	Not applicable
10th segment	Anal cerci present
11th segment	Not applicable