Question: 152. In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on :
(1) 5^{\text {th }} segment
(2) 10^{\text {th }} segment
(3) 8^{\text {th }} and 9^{\text {th }} segment
(4) 11^{\text {th }} segment
Answer: Option (2)
Explanation:
In cockroach, the abdomen is divided into a series of segments.
In both male and female cockroaches, a pair of jointed, filamentous sensory structures known as anal cerci are present.
These anal cerci arise from the 10^{\text {th }} abdominal segment.
They function as sensory organs and help the cockroach detect air currents and vibrations.
Hence, the correct answer is the 10^{\text {th }} segment,
which corresponds to option (2).