In Limulus (king crab), belonging to subclass Xiphosura, the respiratory organs are

Book gills

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Gills

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Tracheae

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Absent

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Solution

The correct option is B Book gills
Book gills are found in the Limulus that consists of membranous folds arranged like the leaves of a book. They are found externally and attached to abdominal appendages and helps in respiration.
Hence In Limulus (king crab), belonging to subclass Xiphosura, the respiratory organs are book gills.
So, the correct answer is 'Book gills'.

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