Question

{"given":"Identify the function and organism associated with Malpighian tubules.","key_observation":"Malpighian tubules are excretory structures unique to insects (and some other arthropods); they open into the alimentary canal and absorb nitrogenous waste from the haemocoel. Annelids use nephridia for excretion.","option_analysis":[{"label":"(A)","text":"Excretory organs of insects","verdict":"correct","explanation":"Malpighian tubules are blind-ended tubules lying freely in the haemocoel of insects that open into the alimentary canal and excrete nitrogenous waste (mainly uric acid)."},{"label":"(B)","text":"Excretory organs of annelids","verdict":"incorrect","explanation":"Annelids possess nephridia as their excretory organs, not Malpighian tubules."},{"label":"(C)","text":"Respiratory organs of insects","verdict":"incorrect","explanation":"Insects respire through a tracheal system (tracheae and tracheoles), not Malpighian tubules."},{"label":"(D)","text":"Respiratory organs of annelids","verdict":"incorrect","explanation":"Annelids respire through moist skin (cutaneous respiration) or gills, not Malpighian tubules."}],"answer":"(A)","formula_steps":[]}