The exotic species, introduced in India are -

Options

A. Lantana
B. Water Hyacinth (Eicchornia)
C. Parthenium
D. All

Answer

### Step-by-Step Solution:

1. **Understanding Exotic Species**:
- Exotic species are organisms that are not native to a particular environment but have been introduced from other regions. They can thrive in the new environment, often leading to rapid population growth.

2. **Impact of Exotic Species**:
- When exotic species are introduced, they can outcompete native species for resources such as food, space, and nutrients. This can lead to a decline in native species populations and disrupt local ecosystems.

3. **Examples of Exotic Species in India**:
- **Lantana**: This is a flowering plant that was introduced into India. It grows rapidly and can outcompete native flora, leading to a decrease in biodiversity.
- **Water Hyacinth**: An aquatic plant that absorbs nutrients from water bodies, it can cause significant harm to aquatic ecosystems by blocking sunlight and depleting oxygen levels, affecting fish and other aquatic life.
- **Parthenium**: Commonly known as Congress grass, this weed can invade agricultural lands and outcompete native plants, leading to reduced crop yields and biodiversity.

4. **Conclusion**:
- The exotic species introduced in India include Lantana, Water Hyacinth, and Parthenium. Therefore, the correct answer to the question is that all these species are considered exotic.

### Final Answer:
The exotic species introduced in India are Lantana, Water Hyacinth, and Parthenium.