Which specialized respiratory organs are present for gaseous exchange in arachnids such as spiders and scorpions?

💡 Solution & Explanation

Arachnids such as spiders and scorpions possess specialized respiratory structures known as book lungs for gas exchange in terrestrial environments. These internal organs consist of stacked, blood-filled lamellae enclosed in a chamber, which resemble the pages of a book to maximize surface area for oxygen absorption. Insects utilize tracheal tubes, whereas aquatic arthropods typically rely on gills.