Question:
Book lungs are the respiratory organs in:
Book lungs are the respiratory organs in:
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Book lungs evolved as an adaptation for terrestrial life, allowing efficient gas exchange in air.
Updated On: Jul 2, 2026
- Mollusca
- Arachnida
- Silverfish
- Earthworm
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The Correct Option is B
Approach Solution - 1
Book lungs are found in:
Spiders (Arachnida class)
Scorpions
Some other arthropods
Named for their folded, book
like structure
Consist of alternating air pockets and blood
filled lamellae
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Approach Solution -2
Elimination by respiratory system type:
Mollusca typically respire through gills or a simple mantle-cavity lung, not book lungs. Silverfish, being wingless insects, rely on a tracheal system of branching air tubes rather than book lungs. Earthworms respire through moist gas exchange across their skin, with no lungs at all. Only Arachnida, such as spiders and scorpions, possess the distinctive stacked, leaf-like lamellae enclosed in a ventral pocket that defines a book lung, evolved from modified ancestral structures for use in air.
Therefore, book lungs belong to Arachnida.
Mollusca typically respire through gills or a simple mantle-cavity lung, not book lungs. Silverfish, being wingless insects, rely on a tracheal system of branching air tubes rather than book lungs. Earthworms respire through moist gas exchange across their skin, with no lungs at all. Only Arachnida, such as spiders and scorpions, possess the distinctive stacked, leaf-like lamellae enclosed in a ventral pocket that defines a book lung, evolved from modified ancestral structures for use in air.
Therefore, book lungs belong to Arachnida.
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