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Q.

Which of the following mouth parts of cockroach are unpaired?

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a

Mandibles and labrum

b

Mandibles and maxillae

c

Maxillae and labium

d

Labrum and Hypopharynx

answer is D.

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Detailed Solution

Labrum and Hypopharynx are unpaired structures in cockroach. Mandibles, maxillae are paired structures. Labium is formed by the fusion of a pair of second maxillae.

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