Specific Plant, Animal and Marine Toxins (Aconite, Abrus, Oleander, Snake, Scorpion, Datura) MCQs

Forensic Medicine · 33 free questions with answers & explanations.

1. Aconite (Aconitum napellus) poisoning causes rapid death primarily by which mechanism?
2. Abrus precatorius (rosary pea) seeds contain abrin, a ribosome-inactivating protein. At a cellular level, abrin causes cell death by:
3. Oleander (Nerium oleander) poisoning mimics which other class of toxin in its clinical presentation and ECG findings?
4. A patient presents with ptosis, blurred vision, descending paralysis, and respiratory failure after a snake bite. The snake responsible most likely belongs to which family, and what is the primary toxin mechanism?
5. Datura (thorn apple) poisoning characteristically produces all of the following EXCEPT:
6. Indian red scorpion (Mesobuthus tamulus) envenomation causes a unique syndrome predominantly mediated by massive catecholamine surge. Which of the following manifestations distinguishes this from other scorpion envenomation worldwide?
7. Cephalopod ink/secretion from the blue-ringed octopus (Hapalochlaena) is lethal because of which toxin, also found in certain pufferfish?
8. Aconitine poisoning from Aconitum ferox causes death primarily through which mechanism?
9. A patient presents with severe gastroenteritis, haemolysis, hepatic failure, and renal failure 24–48 hours after consuming seeds of a plant used in traditional medicine. The seeds were rosary-bead-shaped with a bright red body and black spot. The toxin responsible is:
10. Oleander (Nerium oleander) poisoning causes death by the same mechanism as digitalis glycosides. The primary target and lethal mechanism is:
11. Datura (Dhatura/jimsonweed) poisoning classically produces the triad of hyperthermia, delirium, and which of the following ophthalmic signs?
12. A 35-year-old farmer is bitten by a Russell's viper (Daboia russelii) on the right ankle. Six hours later he develops swelling of the entire limb, gum bleeding, haematuria, and his coagulation screen shows unclottable blood. The mechanism of this coagulopathy is:
13. Indian red scorpion (Mesobuthus tamulus) envenomation causes a clinical syndrome characterised by a massive autonomic storm. The initial pharmacological management of hypertension and pulmonary oedema is:
14. Poisoning with seeds of Cerbera manghas (sea mango) or Thevetia peruviana (yellow oleander) mimics which toxidrome?
15. A 35-year-old man develops severe burning in the mouth, profuse salivation, numbness of the tongue and lips, bradycardia, and hypotension within 30 minutes of ingesting a herbal preparation. Death occurs due to ventricular fibrillation. At autopsy, the stomach contents smell of horseradish. The toxin responsible acts by:
16. Abrus precatorius (rosary pea) seeds are among the most potent plant toxins. The mechanism by which abrin causes cell death is:
17. Oleander (Nerium oleander) poisoning mimics which class of drug toxicity, and what is the most useful forensic confirmatory test?
18. A victim of snakebite by Daboia russelii (Russell's viper) develops severe local swelling, spontaneous bleeding from gums, haematuria, and passes into acute renal failure. The primary mechanism of coagulopathy in Russell's viper envenomation is:
19. Datura poisoning (Dhatura; Jimsonweed) produces a classical toxidrome. Which of the following features is MOST likely to be absent in pure Datura alkaloid (atropine/hyoscine) poisoning compared to organophosphorus poisoning?
20. The neurotoxin responsible for the paralysis seen in puffer fish (Fugu) poisoning is tetrodotoxin. Its mechanism of action is MOST similar to which of the following forensic poisons?
21. A child is brought to casualty after ingesting seeds of a plant in a garden hedge. She has anticholinergic features but the clinical team suspects Datura. Forensic toxicology analysis of the urine confirms tropane alkaloids. Which plant could also produce an identical toxicological picture, as it shares the same alkaloid class?
22. Aconitine poisoning causes potentially fatal arrhythmias. The primary electrophysiological mechanism responsible for the cardiac toxicity of aconitine is:
23. Abrin from Abrus precatorius (Indian liquorice/rosary pea) is a ribosome-inactivating protein (RIP) Type II. Its mechanism of cell death most closely resembles that of:
24. A 45-year-old man presents with bradycardia, heart block, and markedly elevated serum digoxin-like immunoreactive substances (DLIS) after consuming a herbal decoction containing yellow oleander (Thevetia peruviana) seeds. The correct statement about oleander glycoside toxicity compared to pharmaceutical digoxin toxicity is:
25. In the forensic investigation of a snakebite death, the Weil Felix test and ELISA are used to identify the species responsible. The MOST definitive forensic method for species identification from bite site tissue or blood when the snake is not available is:
26. Datura stramonium (jimson weed) poisoning produces the classic toxidrome of dry mouth, tachycardia, dilated pupils, urinary retention, hyperthermia, and agitated delirium. The specific antidote and the correct dose consideration in Datura poisoning is:
27. Tetrodotoxin (TTX) found in pufferfish causes death primarily by which mechanism, and which feature distinguishes it from saxitoxin (paralytic shellfish poison) in terms of clinical presentation?
28. A 28-year-old male presents with severe bradycardia, hypotension, paresthesias, and burning sensation of mouth and throat 30 minutes after consuming herbal tea. ECG shows widened QRS with ventricular ectopics. Which toxin is MOST likely, and what is its primary mechanism?
29. Abrin from Abrus precatorius (rosary pea) shares its mechanism of action with ricin from Ricinus communis. Both are classified as Type II ribosome-inactivating proteins (RIPs). What is the cellular mechanism that makes them extremely lethal even in microgram doses?
30. A farmer in rural India is bitten by a snake. On examination: bilateral ptosis, ophthalmoplegia, and difficulty swallowing without significant local swelling or tissue necrosis. This clinical picture is MOST consistent with envenomation by which snake, and what is the toxin mechanism?
31. Oleander (Nerium oleander) poisoning mimics digoxin toxicity. In postmortem analysis, how can oleander poisoning be confirmed analytically, and what serum electrolyte abnormality is characteristic?
32. Datura (Datura stramonium/metel) poisoning is caused by tropane alkaloids. A patient presents with confusion, mydriasis, dry flushed skin, tachycardia, urinary retention, and visual hallucinations. The mnemonic for anticholinergic toxidrome includes all EXCEPT:
33. Scorpion envenomation in India is MOST commonly caused by Mesobuthus tamulus (Indian red scorpion). The mechanism of its toxin causes a 'catecholamine storm.' Which of the following clinical presentations is MOST specific to severe M. tamulus envenomation in children?