Which of the following is exotic species?

Options

A. Parthenium
B. Lantana
C. Eichhornia
D. All of these

Answer

### Step-by-Step Solution:

1. **Understand the Definition of Exotic Species**:
- Exotic species, also known as alien or introduced species, are organisms that are not native to a particular area. They are introduced from a different geographical range and can sometimes become invasive.

2. **Identify the Given Options**:
- The options provided are:
- Parthenium
- Lantana
- Echornia
- All of these

3. **Analyze Each Option**:
- **Parthenium**:
- Commonly known as carrot grass, it is originally from North America and was introduced to India in the 1950s along with wheat. Therefore, it is an exotic species.
- **Lantana**:
- This plant is also not native to India and originates from the Americas. It has been introduced in many regions, including India, making it an exotic species.
- **Echornia**:
- Known as water hyacinth, it comes from the Amazon basin in South America. It was introduced to India for its aesthetic appeal but has become invasive, thus qualifying as an exotic species.

4. **Conclusion**:
- Since all three options (Parthenium, Lantana, and Echornia) are not native to India and have been introduced from other regions, they all qualify as exotic species.

5. **Final Answer**:
- Therefore, the correct answer to the question "Which of the following is exotic species?" is **All of these** (Option 4).