Question

{"given":"We need to compare the tracheal systems of cockroaches (arthropods) and mammals to identify structural similarities. Cockroaches have a network of tracheal tubes for gas exchange, while mammals have a single trachea as part of their respiratory system.","key_observation":"Both cockroach and mammalian trachea possess structural adaptations to prevent collapse. In cockroaches, the tracheal tubes are reinforced with spiral thickening of cuticle called intima. In mammals, the trachea has C-shaped cartilaginous rings that maintain structural integrity and prevent collapse during breathing.","option_analysis":[{"label":"(A)","text":"paired nature","verdict":"incorrect","explanation":"Cockroaches have multiple spiracles and branching tracheal networks, but this is not truly paired like mammalian lungs. The mammalian trachea is a single tube that bifurcates into bronchi."},{"label":"(B)","text":"non-collapsible walls","verdict":"correct","explanation":"Both systems have structural reinforcements to prevent collapse. Cockroach trachea has spiral thickening (intima) of the cuticular lining, while mammalian trachea has cartilaginous rings. This prevents the airways from collapsing during air movement."},{"label":"(C)","text":"ciliated inner lining","verdict":"incorrect","explanation":"Only mammalian trachea has ciliated pseudostratified epithelium for moving mucus and debris upward. Cockroach tracheal tubes lack ciliated epithelium and instead have a cuticular lining."},{"label":"(D)","text":"origin from head","verdict":"incorrect","explanation":"In mammals, the trachea originates from the larynx in the head/neck region. However, in cockroaches, the tracheal system opens through spiracles located on various body segments, not specifically from the head."}],"answer":"(B)","formula_steps":[]}