Which of the following is not an invasive alien species in the Indian context?

Options

A. Lantana
B. Cynodon
C. Parthenium
D. Eichhornia

Explanation

To determine which of the following is not an invasive alien species in the Indian context, we will analyze the options provided.

### Step-by-Step Solution:

1. **Understand Invasive Alien Species**:
- An invasive alien species is an exotic species that is not naturally found in an area and is not part of the indigenous biodiversity. These species can disrupt local ecosystems and outcompete native species.

2. **Identify the Options**:
- The options provided include:
- A) Lantana
- B) Parthenium
- C) Acornia
- D) Cynodon

3. **Analyze Each Option**:
- **Lantana**: This is known to be an invasive weed that reduces agricultural productivity and can harm livestock. It was introduced to India and has become invasive.
- **Parthenium**: Commonly known as carrot grass, this is another invasive species that reduces agricultural productivity and can cause allergies. It was introduced as a contaminant with imported wheat.
- **Acornia**: Also known as water hyacinth, this aquatic plant is invasive and has been detrimental to water bodies in India, blocking sunlight and depleting oxygen levels.
- **Cynodon**: This is a common type of grass that is native to India and is not an invasive alien species. It is found naturally in India and the eastern hemisphere.

4. **Conclusion**:
- Among the options, **Cynodon (Option D)** is the only species that is not an invasive alien species in the Indian context. The other three (Lantana, Parthenium, and Acornia) are all invasive alien species.

### Final Answer:
- The correct answer is **D) Cynodon**.