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Diseases like the common cold and tuberculosis spread primarily through:
A{'text': 'Droplet infection'}
B{'text': 'Sexual contact'}
C{'text': 'Contaminated water'}
D{'text': 'Insect bites'}
Answer & Solution
Correct answer: A. {'text': 'Droplet infection'}
1. Common cold and tuberculosis are caused by airborne pathogens.
2. Sneezing, coughing or talking releases tiny droplets carrying the pathogen.
3. Inhalation of these droplets by a healthy person spreads infection — this is **droplet infection**.
4. Sexual contact transmits AIDS, not the cold; contaminated water transmits cholera/typhoid; insects transmit malaria/dengue.
5. Hence the answer is **Droplet infection**.
_Source: Selina Concise ICSE Class 8 Biology Ch 8 "Diseases and First Aid", Disease transmission methods_
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