Which of the following is NOT a receptor of cockroach?

Antennae

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Mandibles

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Anal cerci

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Ommatidia

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Solution

The correct option is A Mandibles
Mandibles are triangular chitinous teeth like structure which helps in mastication of the food materials. They do not bear any receptors but antennae bear tactile and olfactory receptors, ommatidia bear photoreceptors and tympanal organs present on anal cerci which sensitive to ground vibrations.
So, the correct answer is 'Mandibles'.

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