Question

Alien species are a threat to native species. Justify taking examples of an animal and a plant alien species.

Answer 1

Alien species become invasive, compete with the native species and cause extinction of indigenous species.

1. Introduction of Nile perch into Lake Victoria lead to extinction of more than 200 species of cichlid fish in that lake.

2. Carrot grass (Parthenium and Lantana) introduced in our country have become invasive and cause environmental damage. They pose a threat to the native species of plants in our forests.