Which one does not exhibit seed dormancy ?

Options

A. Phaseolus
B. Rhizophora
C. Cassia
D. Xanthium

Answer

### Step-by-Step Solution:

1. **Understanding Seed Dormancy**:
- Seed dormancy is a survival mechanism that prevents seeds from germinating even when environmental conditions are favorable. This adaptation is crucial for the conservation of plant species and is particularly important in restoration projects.

2. **Identifying the Options**:
- The question asks which plant does not exhibit seed dormancy. To answer this, we need to analyze the characteristics of different plants mentioned in the options.

3. **Analyzing Rhizophora**:
- Rhizophora is a genus of mangrove trees known for their unique reproductive strategy. They produce a propagule, which is a structure that resembles a seed but is actually a young plant.

4. **Characteristics of Rhizophora**:
- The propagule of Rhizophora is capable of rooting and developing into a new tree while still attached to the parent plant. This means it does not go through a dormant stage as a seed.

5. **Conclusion**:
- Since Rhizophora propagules grow directly into a living plant without experiencing dormancy, it is the correct answer to the question. Other plants typically have seeds that undergo dormancy before germination.

6. **Final Answer**:
- The plant that does not exhibit seed dormancy is **Rhizophora**.