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Which mouth parts of cockroach act as upper lip and lower lip?
(a)Labium and labrum respectively
(b)Labrum and labium respectively
(c)Mandible and maxilla respectively
(d)Hypopharynx and maxilla respectively

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Important Questions on Animal Tissue
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Stomodaeal valve is present in the gut of cockroach. It prevents regurgitation of food from ------------------.
*Note: The given options in book are incorrect and it has been modified here.

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How many mature cartilage cells can be present in a lacuna?

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HARD
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