Select the correct sequence from the following.
I. Juvenile phase —> Senescent phase —> Reproductive phase
II. Juvenile phase —> Reproductive phase —> Senescent phase
III. Reproductive phase —> Juvenile phase —» Senescent phase
IV. Vegetative phase —> Reproductive phase —> Senescent phase

Options

A. I and II
B. I and IV
C. III and IV
D. II and IV

Answer

To solve the question regarding the correct sequence of life phases in organisms, we need to analyze the provided options based on the typical life cycle stages.

### Step-by-Step Solution:

1. **Identify the Phases**:
- The phases mentioned are:
- Juvenile Phase: This is the early growth phase in both plants and animals.
- Reproductive Phase: This is the phase where organisms are capable of reproduction.
- Senescent Phase: This is the phase of aging and decline in function.
- Vegetative Phase: This is primarily a term used for plants, indicating growth before reproduction.

2. **Understand the Typical Sequence**:
- For most organisms, the typical sequence of life phases is:
- **Juvenile Phase** (growth and development) → **Reproductive Phase** (maturity and ability to reproduce) → **Senescent Phase** (aging and decline).
- In plants, the sequence can also include a **Vegetative Phase** before the reproductive phase.

3. **Evaluate Each Option**:
- **Option I**: Juvenile phase → Senescent phase → Reproductive phase
- This sequence is incorrect because the reproductive phase should come before the senescent phase.
- **Option II**: Juvenile phase → Reproductive phase → Senescent phase
- This sequence is correct as it follows the typical life cycle.
- **Option III**: Reproductive phase → Juvenile phase → Senescent phase
- This sequence is incorrect as it starts with the reproductive phase.
- **Option IV**: Vegetative phase → Reproductive phase → Senescent phase
- This sequence is also correct, particularly for plants, as it follows the life cycle stages.

4. **Conclusion**:
- The correct sequences are found in **Option II** and **Option IV**. Therefore, the answer to the question is that both these options represent valid sequences of life phases.

### Final Answer:
The correct sequences are:
- **Option II**: Juvenile phase → Reproductive phase → Senescent phase
- **Option IV**: Vegetative phase → Reproductive phase → Senescent phase