In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on: (1) 5th segment (2) 10th segment (3) 8th and 9th segment (4) 11th segment

Correct Answer: B — 10th segmentStep-by-step Solution:In cockroaches (Periplaneta americana), the abdomen consists of 10 segments. Anal cerci are paired, jointed, filamentous sensory structures present on the 10th abdominal segment in both males and females. They are involved in detecting air movements. Hence, the correct answer is the 10th segment.Key Concepts: Cockroach morphology: abdominal segments, anal cerci location (10th segment), function as sensory organs.

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In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on: (1) 5th segment (2) 10th segment (3) 8th and 9th segment (4) 11th segment

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