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Human Health and Disease MCQs

Class XII Biology • NCERT Based • NEET Practice

📘 Concept Based 📝 Exam Level 🤖 AI Explanations
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446 questions in this chapter
Question 261 of 446
📘 CLASS XII
Coca alkaloid (cocaine) is obtained from coca plant *Erythroxylum* ____, native to South America.
Cocaine is obtained from coca plant *Erythroxylum coca*.
Question 262 of 446
📘 CLASS XII
Cocaine exerts its stimulating action by interfering with the transport of the neurotransmitter ____.
Cocaine interferes with the transport of the neuro-transmitter dopamine.
Question 263 of 446
📘 CLASS XII
Excessive dosage of cocaine causes ____.
Excessive dosage of cocaine causes hallucinations.
Question 264 of 446
📘 CLASS XII
Besides *Atropa belladona*, the plant ____ is well-known for its hallucinogenic properties.
Other well-known plants with hallucinogenic properties are *Atropa belladona* and *Datura*.
Question 265 of 446
📘 CLASS XII
Morphine is a very effective sedative and ____, useful for post-surgery patients.
Morphine is a very effective sedative and pain-killer.
Question 266 of 446
📘 CLASS XII
Tobacco contains an alkaloid called ____, which stimulates the adrenal gland.
Tobacco contains nicotine, an alkaloid, which stimulates the adrenal gland.
Question 267 of 446
📘 CLASS XII
Nicotine stimulates the adrenal gland to release adrenaline, leading to raised blood pressure and increased ____ rate.
Adrenaline and nor-adrenaline raise blood pressure and increase heart rate.
Question 268 of 446
📘 CLASS XII
Smoking increases the ____ content in blood, reducing the concentration of haembound oxygen.
Smoking increases carbon monoxide (CO) content in blood.
Question 269 of 446
📘 CLASS XII
Tobacco chewing is associated with increased risk of cancer of the ____ cavity.
Tobacco chewing is associated with increased risk of cancer of the oral cavity.
Question 270 of 446
📘 CLASS XII
The period between 12–____ years of age is generally considered adolescence.
The period between 12-18 years of age may be thought of as adolescence period.