Bacteria that are hard to destroy are in the inactive or _____ stage?

• A. Cyst
• B. Germ
• C. Vegetative
• D. Spore

Answer: (D)

Bacteria have a dormant, highly resistant form that allows them to survive harsh conditions. This stage, known as a spore, is the one that’s hard to destroy because it’s metabolically inactive and protected by tough coats. The active, growing form is called the vegetative state, which is much more susceptible to heat and disinfectants. Germination is the process by which a spore becomes a vegetative cell, not the dormant state itself, and cyst is not the typical term used for bacteria. So the best answer is spore.