Discussion
Which one of the following animals has “Book Lungs” as a respiratory organ?
Answer: B
Book lungs are found in the scorpion.
Book lungs are respiratory organs of arachnids such as scorpions and many spiders: each is a cavity holding thin, leaf-like folds of tissue stacked like the pages of a book, between which air circulates and exchanges gases with haemolymph.
An earthworm breathes through its moist skin, an octopus uses gills in its mantle cavity, and a starfish exchanges gases through dermal branchiae (papulae) and tube feet. None of them has book lungs.
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