NEET · Biology · STD 11 - 7. Structural organisation in animal
In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on
- A \(10^{\text {th }}\) segment
- B \(8^{\text {th }}\) and \(9^{\text {th }}\) segment
- C \(11^{\text {th }}\) segment
- D \(5^{\text {th }}\) segment
Answer & Solution
Correct Answer
(A) \(10^{\text {th }}\) segment
Step-by-step Solution
Detailed explanation
Correct answer is option (\(1\)), because in both sexes of cockroach, \(10^{\text {th }}\) segment bears a pair of jointed filamentous structures called anal cerci.
Options (\(2\)), (\(3\)) and (\(4\)) are incorrect because \(5^{\text {th }}, 8^{\text {th }}\) and \(9^{\text {th }}\) segments do not bear such structures. In adult cockroaches only \(10^{\text {th }}\) segments are present in abdomen. \(11^{\text {th }}\) abdominal segment is absent.
Options (\(2\)), (\(3\)) and (\(4\)) are incorrect because \(5^{\text {th }}, 8^{\text {th }}\) and \(9^{\text {th }}\) segments do not bear such structures. In adult cockroaches only \(10^{\text {th }}\) segments are present in abdomen. \(11^{\text {th }}\) abdominal segment is absent.
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