Question

Which of the following is a respiratory organ of scorpion?
A. Gill
B. Lung
C. Ctenidia
D. Book lung

Answer 1

Hint: The phylum arthropods consist of the highest number of organisms. They are found in almost all habitats. They bear different characteristics that separate them from other organisms.

Complete Answer:
- We first understand about arthropods as scorpions are arthropods. The organisms of the phylum arthropods have tough exoskeletons, segmented bodies with jointed legs. The exoskeleton is the outer covering found in insects that protect the outer surface of the organism and maintain the muscle attached with it.
- The organism of phylum vertebrates consists of endoskeletons that mean they consist of skeletons inside the body that give the body its structure by holding the organs and protecting them. It consists of mineralized tissue that enables the muscle movement attached with it.
- Now, the scorpions belong to class Arachnida. It has cephalothorax, abdomen and eight pairs of legs. The anterior pairs of appendages are modified as mouthparts that is, chelicerae.
- The second pair of appendages, that is, pedipalps involved in holding and sensing the prey. They have two types of respiratory organs found in the arachnids that are, book lungs and tracheae. The book lung is the hard pockets found in the under part of the abdomen, the gas gets diffused between the haemolymph that is circulating inside the lamellae. The tracheal system comprises many tubes that open to the exterior by paired respiratory pores same as in insects.

Thus, the correct option is ‘D’ Book lungs.

Note: Like the scorpion the spiders also respire through the book lungs. Both the spiders and scorpion belong to the same class that is Arachnidia. The gills are found in reptiles, fishes, and some of the amphibians that are involved in the respiration process. Lungs are mostly found in mammals that involve in the filtration of air.