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B
Haemolymph
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C
Alimentary canal
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D
None of the above
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Solution
The correct option is B Haemolymph
Malpighian tubules are excretory organs present in the cockroach. They lie freely in haemolymph. They remove excretory products from the haemolymph and open in the alimentary canal at the junction of the midgut and hindgut. In each cockroach, they are about 150 in number.