Which statement about spores is true?

• A. They are the active form of bacteria
• B. They are easily killed by ordinary disinfectants
• C. They are the inactive state of bacteria that is difficult to kill
• D. They are viruses

Answer: (C)

Spore-forming bacteria produce endospores, a dormant, metabolically minimal form with a tough protective coat. This state lets them survive heat, drying, chemicals, and radiation that would kill the active cells. Because of that resilience, spores aren’t reliably eliminated by ordinary disinfectants used in salons; they require specialized sporicidal products or sterilization methods such as proper autoclaving. When conditions improve, spores can germinate back into active bacteria. So, describing spores as the inactive state of bacteria that is difficult to kill is accurate. They are not the active form, and they are not viruses, which are different types of pathogens treated with different agents.