Forensic Toxicology Practice Questions

Q: Which of the following toxins will lead to the appearance of gastric mucosa as shown in the image?

Copper sulfate. ***Copper sulfate*** - The image shows a gastric mucosa with a **bluish-green discoloration**, which is highly characteristic of ingestion of **copper sulfate**. - Copper sulfate is a **corrosive agent** that causes direct chemical injury, leading to significant mucosal damage and this distinct color change upon contact. *Iron oxide* - Ingestion of iron compounds primarily causes direct local **gastrointestinal irritation** and systemic toxicity, but does not result in a bluish-green discoloration of the gastric mucosa. - Iron poisoning typically leads to symptoms like **vomiting**, **diarrhea**, and potentially **hemorrhage**, but not this specific color change. *Arsenic trioxide* - Arsenic poisoning, while causing severe gastrointestinal symptoms such as **vomiting**, **diarrhea**, and **abdominal pain**, does not produce a characteristic bluish-green staining of the gastric mucosa. - Prolonged exposure can lead to **multi-organ failure** and **neurological symptoms**, but the visual appearance in the image is not consistent. *Mercury* - Mercury poisoning can cause severe **gastrointestinal inflammation** and necrosis due to its corrosive effects, particularly with salts like mercuric chloride. - However, it does not typically lead to the distinct **bluish-green discoloration** seen in the image, which is pathognomonic for copper sulfate ingestion.

Q: The image given below shows:

Castor seeds. ***Castor seeds*** - The image displays seeds with a characteristic **mottled appearance** and a prominent **caruncle**, which are key features of **castor seeds** (Ricinus communis). - Castor seeds contain **ricin**, a highly toxic protein that can cause severe gastrointestinal symptoms, hemorrhage, and multi-organ failure if ingested. *Croton seeds* - Croton seeds (Croton tiglium) are typically **smaller, glossy, and more uniformly shaped** compared to the seeds in the image. - While also toxic, containing phorbol esters causing severe purgation, their morphological features are distinct from those shown. *Marking nut* - Marking nuts (Semecarpus anacardium) are typically **heart-shaped or kidney-shaped**, black, and have an oily resin. - They are known for causing vesicant dermatitis and are used in traditional medicine, but their appearance differs from the seeds in the image. *Jequirity seeds* - Jequirity seeds (Abrus precatorius) are typically **small, bright red with a black spot**, resembling a ladybird beetle. - They contain **abrin**, another toxic protein similar to ricin, but their distinctive coloration makes them easily distinguishable from castor seeds.

Q: The seeds shown in the image below have which toxin? (Recent NEET Pattern 2016-17)

Abrin. ***Abrin*** - The seeds shown in the image are characteristic of **Rosary Pea (Abrus precatorius)**, known for their bright red color with a black spot. - These seeds contain the potent **ribosome-inactivating protein toxin** called abrin. *Ricin* - **Ricin** is a toxin derived from the seeds of the **castor oil plant (Ricinus communis)**, which look different from the seeds pictured. - Castor seeds are typically mottled brown, black, and white, not bright red with a black spot. *Calotoxin* - **Calotoxin** is a cardiac glycoside found in plants like **Calotropis (milkweed)**. - The seeds of Calotropis are flat, brown, and have a tuft of silky hair, which is completely different from the seeds shown. *Plumbagin* - **Plumbagin** is a naphthoquinone compound found in plants like **Plumbago zeylanica**. - This compound is not associated with the red and black seeds depicted in the image.

Q: The following image shows:

Castor seeds. ***Castor seeds*** - The image displays several seeds that are **oval-shaped** with a **mottled brown and black pattern**, a characteristic appearance of **castor beans**. - Castor seeds (Ricinus communis) contain **ricin**, a highly toxic protein that can cause severe gastrointestinal symptoms, hemorrhage, and multi-organ failure if ingested. *Croton seeds* - Croton seeds are generally smaller and more uniformly black or dark brown, lacking the distinct **marbled appearance** of castor seeds. - While also toxic, they contain **croton oil**, which acts as a powerful purgative and an irritant. *Marking nut* - Marking nut (Semecarpus anacardium) is typically **heart-shaped or kidney-shaped** and black, which is visually distinct from the seeds shown. - It contains **bhilawanol**, an irritant resin that can cause severe blistering and skin reactions upon contact. *Betel nut* - Betel nuts are usually **round or oval** and range from reddish-brown to dark brown, often with a fibrous texture, but do not exhibit the **mottled pattern** seen in the image. - Chewed for its **mild stimulant effect**, it is associated with oral submucous fibrosis and oral cancer with chronic use.

Q: All are true about the poisoning caused by following plant except: (Recent NEET Pattern 2016-17)

Urine alkalization. ***Urine alkalization*** - There is **no specific role** for **urine alkalization** in the management of castor bean (ricin) poisoning. - Management is primarily **supportive**, including gastrointestinal decontamination, fluid resuscitation, and symptomatic treatment. - Urine alkalization is used in salicylate or barbiturate poisoning, **not in ricin poisoning**. *Toxic principle is ricin* - The castor bean plant (**Ricinus communis**) contains **ricin**, a highly potent **lectin** and protein synthesis inhibitor. - Ricin causes severe **cellular toxicity** leading to gastrointestinal, hepatic, renal, and systemic manifestations. - This is a **TRUE statement**. *Fatal dose is 1 mg/kg body weight* - The **fatal dose of ricin** is approximately **1 mg/kg body weight** when ingested. - Ingestion of even **1-3 chewed castor beans** can be fatal in adults, making it one of the most poisonous plants. - This is a **TRUE statement**. *Opisthotonus* - **Opisthotonus** (backward arching due to severe muscle spasm) can occur in **severe cases** of ricin poisoning as a neurological manifestation. - While more classically associated with **tetanus** or **strychnine poisoning**, severe ricin toxicity can cause convulsions and opisthotonus. - This is considered a **TRUE statement** in the context of severe ricin poisoning.

Q: What is the type of venom of the snake shown below? (Recent NEET Pattern 2016-17)

Vasculotoxic and hemotoxic. ***Vasculotoxic and hemotoxic*** - The image displays a **Russell's viper** (*Daboia russelii*), identified by its characteristic chain of three prominent, dark, oval, or rhomboidal spots. - The venom of the Russell's viper is primarily **vasculotoxic** (affecting blood vessels) and **hemotoxic** (affecting blood components), causing symptoms like local pain, swelling, blistering, and coagulopathy leading to bleeding. *Vasculotoxic* - While Russell's viper venom is indeed vasculotoxic, this option is incomplete as it lacks the hemotoxic component which is also significant. - **Vasculotoxicity** leads to damage to blood vessel walls, causing leakage and local tissue damage. *Neurotoxic* - Neurotoxic venom primarily affects the nervous system, leading to paralysis and respiratory failure, which is characteristic of snakes like **cobras** and **kraits**. - The Russell's viper venom does not have significant neurotoxic effects in humans. *Hemotoxic* - While Russell's viper venom is hemotoxic, this option is incomplete as it misses the **vasculotoxic** effects that are a crucial part of its pathology. - **Hemotoxicity** impacts blood clotting factors and red blood cells, leading to internal and external bleeding.

Q: What is the nature of the venom produced by the snake shown below? (Recent NEET Pattern 2016-17)

Neurotoxic. ***Neurotoxic*** - The image shows a **Banded Krait** (*Bungarus fasciatus*), identified by its distinctive alternating bands of yellow and black. - Kraits belong to the **Elapidae family** (along with cobras and coral snakes) and produce **predominantly neurotoxic venom**. - The venom contains **α-bungarotoxin** and **β-bungarotoxin**, which block neuromuscular transmission causing **descending paralysis**. - **Clinical features** include ptosis, ophthalmoplegia, paralysis, respiratory failure, and minimal local swelling - classic neurotoxic presentation. - In forensic medicine classification, kraits are categorized as **neurotoxic snakes**, unlike vipers which are hemotoxic/vasculotoxic. *Vasculotoxic and hemotoxic* - This describes **viper venom** (Russell's viper, Saw-scaled viper), not krait venom. - Vipers cause **extensive local tissue damage, bleeding, coagulopathy**, and necrosis - features NOT seen with krait bites. - Krait bites show **minimal local effects** with predominantly systemic neurotoxic manifestations. *Vasculotoxic* - Vasculotoxic effects (endothelial damage, vascular permeability) are characteristic of **viper envenomation**, not kraits. - Banded Krait venom acts primarily on the **nervous system**, not blood vessels. *Hemotoxic* - Hemotoxic effects (hemolysis, coagulopathy, thrombocytopenia) are features of **viper venom**. - Kraits produce **neurotoxic venom** that causes paralysis without significant hematological effects. - The absence of bleeding and coagulation defects helps differentiate krait from viper bites clinically.

Q: Which of the following is not true about the symptoms experienced after consumption of the poison from the plant shown below?

Sour taste. ***Sour taste*** - The plant shown is likely a species of **Datura**, also known as Jimsonweed or thorn apple, which contains **anticholinergic alkaloids** like atropine and scopolamine. - These alkaloids cause an array of symptoms consistent with **anticholinergic toxidrome**, but **sour taste** is not a typical manifestation of anticholinergic poisoning. *Dryness of the mouth* - **Atropine** and **scopolamine**, present in Datura, block muscarinic acetylcholine receptors, leading to decreased salivary gland secretions. - This results in a profound sensation of **dry mouth** (xerostomia), a classic anticholinergic symptom. *Urine retention* - Anticholinergic agents like those in Datura inhibit the contraction of the **detrusor muscle** of the bladder and promote contraction of the urethral sphincter. - This combination impairs bladder emptying and causes **urinary retention**, another hallmark of anticholinergic poisoning. *Dilated pupils* - Anticholinergic compounds block the M3 muscarinic receptors in the **iris sphincter muscle**, preventing constriction. - This leads to **mydriasis** (dilated pupils), which is a characteristic sign often summarized as "blind as a bat" in the anticholinergic toxidrome.

Q: The seeds of the plant shown below resemble which of the following? (Recent NEET Pattern 2016-17)

Ricinus communis. ***Ricinus communis*** - The image displays a **spiny fruit** containing numerous **brown, mottled seeds** that are characteristic of the *Ricinus communis* plant, also known as the **castor bean plant**. - **Castor seeds** are highly toxic due to the presence of **ricin**, a potent protein toxin. *Semecarpus anacardium* - This plant, commonly known as **marking nut** or **Bhallataka**, produces an **oval-shaped, black nut** with a cup-shaped fleshy receptacle. - Its seeds are generally **kidney-shaped** and black, differing from the seeds shown in the image. *Capsicum* - *Capsicum* refers to **chili peppers**, which produce berries containing small, **flat, pale yellow or white seeds**. - The seeds in the image are **dark brown and irregular**, not consistent with *Capsicum* seeds. *Nerium odorum* - *Nerium odorum* is a species of **oleander**, a highly toxic plant whose seeds are typically found in **long, narrow follicles**. - The seeds are usually **light brown to reddish-brown**, often with hairy tufts, which do not match the appearance of the seeds in the image.

Question 1

Which of the following toxins will lead to the appearance of gastric mucosa as shown in the image?

Accepted Answer

Copper sulfate

Answer

Iron oxide

Answer

Arsenic trioxide

Answer

Mercury

Question 2

The image given below shows:

Accepted Answer

Castor seeds

Answer

Croton seeds

Answer

Marking nut

Answer

Jequirity seeds

Question 3

The seeds shown in the image below have which toxin? (Recent NEET Pattern 2016-17)

Accepted Answer

Abrin

Answer

Ricin

Answer

Calotoxin

Answer

Plumbagin

Question 4

The following image shows:

Accepted Answer

Castor seeds

Answer

Croton seeds

Answer

Marking nut

Answer

Betel nut

Question 5

All are true about the poisoning caused by following plant except: (Recent NEET Pattern 2016-17)

Accepted Answer

Urine alkalization

Answer

Toxic principle is ricin

Answer

Fatal dose is 1 mg/kg body weight

Answer

Opisthotonus

Question 6

What is the type of venom of the snake shown below? (Recent NEET Pattern 2016-17)

Accepted Answer

Vasculotoxic and hemotoxic

Answer

Vasculotoxic

Answer

Neurotoxic

Answer

Hemotoxic

Question 7

What is the nature of the venom produced by the snake shown below? (Recent NEET Pattern 2016-17)

Accepted Answer

Neurotoxic

Answer

Vasculotoxic

Answer

Vasculotoxic and hemotoxic

Answer

Hemotoxic

Question 8

Which of the following is not true about the poisoning caused by seeds shown below?

Accepted Answer

Toxin potentiates neurotransmitter glycine effect at pre-synaptic receptor

Answer

Opisthotonos

Answer

Uncrushed seeds will not lead to poisoning

Answer

Post mortem caloricity

Question 9

Which of the following is not true about the symptoms experienced after consumption of the poison from the plant shown below?

Accepted Answer

Sour taste

Answer

Dryness of the mouth

Answer

Urine retention

Answer

Dilated pupils

Question 10

The seeds of the plant shown below resemble which of the following? (Recent NEET Pattern 2016-17)

Accepted Answer

Ricinus communis

Answer

Semecarpus anacardium

Answer

Capsicum

Answer

Nerium odorum

Forensic Toxicology — MCQs

Forensic Toxicology — MCQs

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