Class XII · Biology practice

Human Health and Disease MCQs

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446 questions in this collection · Page 27 of 45

Question 261 of 446

📘 CLASS XII

Human Health And Disease

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

Human Health And Disease

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

Human Health And Disease

Excessive dosage of cocaine causes ____.

Excessive dosage of cocaine causes hallucinations.

Question 264 of 446

📘 CLASS XII

Human Health And Disease

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

Human Health And Disease

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

Human Health And Disease

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

Human Health And Disease

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

Human Health And Disease

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

Human Health And Disease

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

Human Health And Disease

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.

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