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Biodiversity, Conservation and Environmental Issues — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYBiodiversity, Conservation and Environmental Issues5 Marks
Question
What do you understand by invasive species? How does it affect local population?
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Answer

  1. New species are introduced into any ecosystem either accidentally or intentionally.
  2. Such introduction proves harmful for existing species.
  3. Sometimes even local species get extinct.
  4. If such extinction happens, then this new species is called an invasive species. E.g. Parthenium or carrot grass, Lantana and water hyacinth (Eichhornia) are such invasive plant species.
  5. Nile perch which is a predator fish in Lake Victoria cause harm to 200 local species of Cichlid fish.
  6. Clarias gariepinus (African catfish) was brought to India for aquaculture purpose. This catfish species has proved harmful to endemic catfish varieties.
  7. Since there is lack of local predator, this alien species survives and cause harmful effect on local species.

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