Which of these is not example of alien species invasion ?

Options

A. Nile perch introduced in Lake Victoria
B. African catfish in Indian River
C. Water hyacinth in india
D. Soyabean cultivation in Amazon forest

Answer

To determine which option is not an example of alien species invasion, we can analyze each option provided in the question:

1. **Nile Perch introduced into Lake Victoria**: This is a classic example of alien species invasion. The introduction of Nile Perch led to the extinction of many native species in the lake, showcasing the negative impact of invasive species.

2. **African catfish in Indian rivers**: This is also an example of alien species invasion. The introduction of the African catfish (Clarias gariepinus) poses a threat to indigenous fish species in India, which is a clear case of an invasive species affecting local biodiversity.

3. **Water hyacinth in India**: Water hyacinth is another example of an alien species invasion. It is an invasive aquatic plant that has caused significant ecological and economic problems in water bodies across India.

4. **Soybean cultivation in the Amazon forest**: This option does not represent an alien species invasion. Instead, it is an example of habitat loss and fragmentation, as the conversion of rainforest land for soybean cultivation leads to significant biodiversity loss but does not involve the introduction of an invasive species.

Based on this analysis, the answer to the question "Which of these is not an example of alien species invasion?" is:

**Soybean cultivation in the Amazon forest.**

### Step-by-Step Solution:
1. **Identify the options provided**: List the four options given in the question.
2. **Analyze each option**: Determine if each option represents an alien species invasion or not.
3. **Conclude based on analysis**: Identify which option does not fit the criteria of alien species invasion.