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 of the given options is not an example of alien species invasion, we need to analyze each option in the context of what constitutes alien species invasion.

**Step 1: Understand Alien Species Invasion**
Alien species invasion refers to the introduction of non-native species into an ecosystem, which can lead to harm to native species and biodiversity. This often occurs when species are introduced intentionally or accidentally, and they outcompete or disrupt the native species.

**Step 2: Analyze Each Option**
1. **Nile Perch introduced in Lake Victoria**: This is an example of alien species invasion. The Nile perch was introduced to Lake Victoria, leading to the decline of native fish species.

2. **African Catfish in Indian River**: This is also an example of alien species invasion. The introduction of African catfish has negatively impacted the native fish populations in Indian rivers.

3. **Water Hyacinth in India**: This is another example of alien species invasion. Water hyacinth, introduced for ornamental purposes, has spread rapidly and disrupted local aquatic ecosystems.

4. **Soybean Cultivation in Amazon Forest**: This option does not represent an alien species invasion. While soybean cultivation may have ecological impacts, it does not involve the introduction of a non-native species into an ecosystem in the same way as the other options.

**Step 3: Conclusion**
Based on the analysis, the option that is not an example of alien species invasion is **Soybean cultivation in Amazon forest**.

**Final Answer**: Soybean cultivation in Amazon forest (Option 4).

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