MEDIUM
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IMPORTANT
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Identify the structures labelled A, B, C and D respectively in the alimentary canal of cockroach.

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Important Questions on Structural Organisation in Animals (Animal Morphology)

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Which of the following is the correct statement for the structure labelled 'A' in the diagram?

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In frog, heart is enclosed within two-layered sac called
EASY
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IMPORTANT
A thin-walled, triangular chamber attached dorsally to heart of frog is known as