Cockroach differs from frog in having

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salivary glands

rectum

oesophagus

gall bladder

answer is A.

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Detailed Solution

Salivary glands are present in cockroach, but absent in frog.

Oesophagus and rectum are present in the alimentary canal of both. Gall bladder is present in frog, but not in the cockroach.

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