Which of the following is not an invasive alien species in the Indian context?
(a) Lantana
(b) Cynodon
(c) Parthenium
(d) Eichhornia

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 need to analyze each option provided:

1. **Lantana (Lantana camara)**: This plant was introduced to India as an ornamental species. However, it has become invasive, spreading rapidly and outcompeting native flora. Therefore, Lantana is an invasive alien species.

2. **Cynodon (Cynodon dactylon)**: Cynodon, commonly known as Bermuda grass, is a native grass species in many parts of the world, including India. It is not considered an invasive alien species in the Indian context.

3. **Parthenium (Parthenium hysterophorus)**: This plant was introduced to India as a contaminant with wheat. It has since become highly invasive, spreading rapidly and causing harm to native species and ecosystems. Thus, Parthenium is an invasive alien species.

4. **Eichhornia (Eichhornia crassipes)**: Commonly known as water hyacinth, this species was introduced to India and has become notorious for its rapid growth in water bodies, leading to significant ecological problems. It is classified as an invasive alien species.

Based on this analysis, the correct answer is:

**(b) Cynodon** - it is not an invasive alien species in the Indian context.