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Read the following statements regarding the mouthparts of Periplaneta and identify the incorrect statement/s.
I) The mouthparts of Periplaneta are of biting and chewing type
II) Mouthparts include of a labrum (upper lip), labium (lower lip), a pair of mandibles, a pair of first maxillae and a hypopharynx.
III) Mandibles are used for cleaning the antennae and the front pairs of legs.
IV) The second maxillae fuse together to form a broad plate like labium, or lower lip.

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III and IV

I and IV

Only III

Only IV

answer is C.

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Detailed Solution

Mandibles are a pair of unjointed, small triangular, strongly sclerotised structures, present on the sides of the mouth, connected to the genae.

Mandibles move horizontally with the help of adductor and abductor muscles and masticate the food.

A pair of first maxillae are used for cleaning the antennae and the front pairs of legs.

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