Question

Which one of the following animals has “Book Lungs” as a respiratory organ?

• A. Earthworm
• B. Scorpion
• C. Octopus
• D. Starfish

Hint:

Remember: {Arachnids} (scorpions, spiders) have book lungs, while mollusks like octopus have gills, annelids like earthworms respire through skin, and echinoderms like starfish use dermal branchiae.

Answer 1

The Correct Option is B

Step 1: What are book lungs?
- Book lungs are respiratory organs consisting of stacked, plate-like structures resembling the pages of a book.
- They provide a large surface area for gas exchange and are filled with hemolymph. Step 2: Distribution of book lungs.
- Found in arachnids such as scorpions and some spiders.
- They are not present in earthworms (respiration through moist skin), octopuses (respire via gills), or starfishes (respiration via tube feet and dermal branchiae). Therefore, the correct animal with book lungs is Scorpion.