Introduction of alien species has led to environmental damage and decline of indigenous species. Give any one example of how it has affected the indigenous species? 


  • Nile perch introduced in Lake Victoria eventually led to the extinction of an ecologically unique assemblage of more than 200 species of cichild fish.
  • Parthenium/Lantana/water hyacinth caused environmental damage and threat to our native species 
  • African catfish-Clarias gariepinus introduced for aquaculture purposes is posing a threat to the indigenous catfishes in our rivers.


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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.