Which one of the following organisms reproduces sexually only once in its life time?

Options

A. Banana plant
B. Mango
C. Tomato
D. Eucalyptus

Answer

To determine which organism reproduces sexually only once in its lifetime, we need to analyze the reproductive strategies of the given options: banana plant, mango, tomato, and eucalyptus.

### Step-by-Step Solution:

1. **Understanding the Options**:
- **Banana Plant**: Known for its unique reproductive strategy, the banana plant is a perennial herb that reproduces only once in its lifetime. After flowering and fruiting, the main plant dies, but new shoots (suckers) can grow from the base.
- **Mango**: Mango trees are perennial and can flower and produce fruit multiple times throughout their lifespan, which can last for many years.
- **Tomato**: Tomato plants are typically annuals, but they can produce fruit multiple times in a growing season. They do not reproduce only once in their lifetime.
- **Eucalyptus**: Eucalyptus trees are also perennial and can flower and reproduce multiple times over their lifespan.

2. **Identifying the Correct Answer**:
- Among the options, the banana plant is unique because it flowers and reproduces sexually only once before the main plant dies. This characteristic distinguishes it from the other options, which can reproduce multiple times.

3. **Conclusion**:
- Therefore, the organism that reproduces sexually only once in its lifetime is the **banana plant**.

### Final Answer:
**Option A: Banana Plant**