More than ___________ compounds of tar of tobacco smoke are involved to cause cancer?
Correct answer: D. 10
- A. 5
- B. 90
- C. 15
- D. 10
Explanation
The question uses the conventional textbook figure that more than 10 compounds in tobacco tar contribute to cancer, so option d is intended. These carcinogenic substances can damage DNA and promote uncontrolled cell division. Students may choose 90 because tobacco smoke contains many harmful chemicals overall, but that is not the specific figure stated for the carcinogenic tar compounds in this syllabus.
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About Effects of Smoking
Smoking exposes the respiratory system to nicotine, tar and carbon monoxide, damaging cilia, reducing oxygen transport and narrowing or inflaming airways. The topic covers dependence, chronic bronchitis, emphysema, lung cancer and cardiovascular effects, while separating short-term physiological changes from long-term disease.
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