Q17 (CDS-I/2018) Science & Technology › Biotechnology & Health › Human infectious diseases Answer Verified

Statement I : A person may suffer from tuberculosis if she/he frequently visits crowded place. Statement I : Bacteria of tuberculosis spread through droplets by sneezing or coughing.

Both the statements are individually true and Statement II is the correct explanation of Statement I

Both the statements are individually true but Statement II is not the correct explanation of Statement I

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Result

Your answer: — · Correct: A

Explanation

Statement I is true because frequenting crowded places significantly increases the risk of tuberculosis (TB) exposure and transmission [4]. Overcrowded environments facilitate the concentration of infectious particles in shared air spaces [2]. Statement II is also true and provides the correct explanation for Statement I. Tuberculosis is caused by the bacterium Mycobacterium tuberculosis, which is primarily transmitted through the airborne route [3]. When an infected person with pulmonary TB coughs, sneezes, talks, or sings, they expel tiny infectious particles known as droplet nuclei [3]. These particles can remain suspended in the air for extended periods and be inhaled by others. In crowded or poorly ventilated areas, the density of these droplet nuclei increases, making it much more likely for a healthy individual to inhale the bacteria and contract the infection [1].

Sources

[4] https://pmc.ncbi.nlm.nih.gov/articles/PMC8966856/
[1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > Activity 3.4: Let us find out > p. 34
[2] https://pmc.ncbi.nlm.nih.gov/articles/PMC11687482/
[3] https://www.dhs.wisconsin.gov/tb/precautions.htm

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Statement I : A person may suffer from tuberculosis if she/he frequently visits crowded place. Statement I : Bacteria of tuberculosis spread through droplets by sneezing or coughing.

Explanation

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