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Which of the following best explains why most STDs are spread by sexual contact?
AThey are vector-borne by mosquitoes (option)
BThey are airborne in coughs
CThey are food-borne
DMany pathogens survive in mucosal secretions exchanged during intercourse
Answer & Solution
Correct answer: D. Many pathogens survive in mucosal secretions exchanged during intercourse
1. STD pathogens are typically present in genital and mucosal fluids.
2. Direct mucosal contact during intercourse efficiently transfers them.
3. They generally survive poorly outside the host, so other routes are minor.
_Source: NCERT Class 10 Science, Ch 7 "How do Organisms Reproduce", §7.3.4_
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