Question

In which of the following group of animals, the spiracle, trachea and tracheoles are associated with the respiratory system?

• A. Frog and earthworm
• B. Prawns, molluscs and fishes
• C. Lizard, bird and fishes
• D. Cockroaches, grass hopper and houseflies.

Answer 1

The correct option is D Cockroaches, grass hopper and houseflies.

Great majority of insects breathe air by means of an elaborate and most efficient gas exchange system made of branching elastic air tubes or tracheae called the tracheal system. In majority if insect's, tracheal system serves for transport of oxygen and carbon dioxide. Each trachea is an air tube lined with epithelial cells and spiral ridges, called as the taenidia. Tracheae open externally by small openings called spiracles through which the air enters the system. The tracheae are branched into finer branches called the tracheoles which are air capillaries without inner taenidia ridges.
Of the given options, the organisms in option D comes under the class Insecta of the phylum Arthropoda.
Therefore, the correct answer is option D.