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Probiotics regain importance after a course of antibiotics because the antibiotics had which effect on useful microbes?
APermanently killed all gut bacteria
BMade the useful microbes inactive
CTurned them into harmful microbes
DMultiplied them rapidly
Answer & Solution
Correct answer: B. Made the useful microbes inactive
1. The chapter states useful microbes become inactive due to antibiotics.
2. Probiotics then make these inactive microbes active again.
3. "Permanently killed all" overstates it, since probiotics can reactivate them.
4. Antibiotics do not convert useful microbes into harmful ones nor multiply them.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 7 "Introduction to Microbiology", p.88_
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