Which of the following is the stage of suspended development?

Options

A. Migration
B. Hibernation
C. Aestivation
D. Diapause.

Answer

To solve the question "Which of the following is the stage of suspended development?" we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Options**:
- We have four options: Migration, Hibernation, Estivation, and Diapause.

2. **Analyzing Migration**:
- **Definition**: Migration is the movement of individuals from one place to another.
- **Impact on Development**: During migration, there is no suspended growth; the individuals continue their normal growth and development.
- **Conclusion**: Migration is **not** a stage of suspended development.

3. **Analyzing Hibernation**:
- **Definition**: Hibernation is often referred to as "winter sleep," where organisms enter a resting stage during harsh winter conditions.
- **Impact on Development**: While metabolic activity decreases, development does not stop completely; it continues at a reduced rate.
- **Conclusion**: Hibernation is **not** a stage of suspended development.

4. **Analyzing Estivation**:
- **Definition**: Estivation is similar to hibernation but occurs during hot summer conditions.
- **Impact on Development**: Like hibernation, metabolic activity is reduced, but development continues.
- **Conclusion**: Estivation is **not** a stage of suspended development.

5. **Analyzing Diapause**:
- **Definition**: Diapause is a stage that certain insects and zooplankton enter to survive unfavorable conditions.
- **Impact on Development**: During diapause, development is completely suspended until favorable conditions return.
- **Conclusion**: Diapause **is** a stage of suspended development.

6. **Final Answer**:
- The correct answer is **Diapause**.