Under unfit conditions microbes remain inactive inside till they find the conditions around them fit for suvival. The structure is called ________.

Options

A. colonies
B. cyst
C. spores
D. none of these

Answer

The structure that allows microbes to remain inactive under unfit conditions until they find suitable conditions for survival is called a **spore**.

### Step-by-Step Solution:

1. **Understanding Microbial Survival**: Microbes can sometimes find themselves in environments that are not conducive to their survival. During these times, they need a way to survive until conditions improve.

2. **Dormant Stage**: In such unfit conditions, microbes enter a dormant stage. This means they are inactive and not growing or reproducing.

3. **Protective Structure**: To survive these harsh conditions, many microbes form a protective structure that helps them withstand extreme environments.

4. **Identification of the Structure**: This protective structure is known as a spore. Spores are resistant to heat, desiccation, and other unfavorable conditions.

5. **Conclusion**: Therefore, the correct term for the structure that allows microbes to remain inactive until conditions are favorable is **spore**.