In unfavourable adverse conditions bacteria produce resting spores called

Options

A. Exospores
B. Chlamydospores
C. Oidia
D. Endospores.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks what type of resting spores bacteria produce under unfavorable or adverse conditions.

2. **Defining Unfavorable Conditions**: Unfavorable conditions refer to environments that are not suitable for bacterial growth and reproduction. These could include extreme temperatures, lack of nutrients, or other stress factors.

3. **Purpose of Spores**: Bacteria produce resting spores to ensure the survival of their species during these adverse conditions. The spores allow them to remain dormant until conditions improve.

4. **Identifying the Types of Spores**: The options provided are:
- Exospores
- Chlamydospores
- Oidia
- Endospores

5. **Evaluating Each Option**:
- **Exospores**: These are not typically associated with bacteria, so this option is incorrect.
- **Chlamydospores**: These are a type of fungal spore, not produced by bacteria, making this option incorrect.
- **Oidia**: These are also not related to bacterial resting spores, thus this option is incorrect.
- **Endospores**: These are indeed resting spores produced by bacteria in response to unfavorable conditions.

6. **Conclusion**: The correct answer is **endospores**, as they are the resting spores that bacteria produce to survive adverse conditions.

**Final Answer**: In unfavorable adverse conditions, bacteria produce resting spores called **endospores**.

---