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Question
Which of the following is not an example of alien species invasion?
Which of the following is not an example of alien species invasion?
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Solution
The correct option is B Steller’s sea cow
When alien species are introduced unintentionally or deliberately for whatever purpose, some of them turn invasive and cause decline or extinction of indigenous species. They prey on native species or outcompete them for food and shelter in the absence of natural predators. Clarias gariepinus (African catfish), Lantana, and Eicchornia (water hyacinth) are alien species which have caused damage to the environment and pose a threat to native species.
Clarias gariepinus is a species of catfish that is native to Africa. It was introduced in India for aquaculture but now poses a threat to the indigenous catfishes.
Lantana is native to tropical regions of South America. It is an invasive species that was introduced in India by the British as an ornamental plant species. It competes with native plants for space and resources, and also alters the nutrient cycle in the soil. It invades agricultural landscapes, forests and wastelands and harms commercial interests of farmers and foresters.
Eichhornia (water hyacinth) is an invasive weed native to South America that was introduced in West Bengal as an ornamental plant. It is commonly called ‘Terror of Bengal’ because it is highly invasive and spreads rapidly on standing water bodies thereby cutting off the oxygen supply for the aquatic organisms and competing with the native species for nutrients and oxygen.
Steller’s sea cow is an extinct animal which was wiped off the surface of earth because of overkilling and hunting by humans.
Steller’s sea cow
When alien species are introduced unintentionally or deliberately for whatever purpose, some of them turn invasive and cause decline or extinction of indigenous species. They prey on native species or outcompete them for food and shelter in the absence of natural predators. Clarias gariepinus (African catfish), Lantana, and Eicchornia (water hyacinth) are alien species which have caused damage to the environment and pose a threat to native species.
Clarias gariepinus is a species of catfish that is native to Africa. It was introduced in India for aquaculture but now poses a threat to the indigenous catfishes.
Lantana is native to tropical regions of South America. It is an invasive species that was introduced in India by the British as an ornamental plant species. It competes with native plants for space and resources, and also alters the nutrient cycle in the soil. It invades agricultural landscapes, forests and wastelands and harms commercial interests of farmers and foresters.
Eichhornia (water hyacinth) is an invasive weed native to South America that was introduced in West Bengal as an ornamental plant. It is commonly called ‘Terror of Bengal’ because it is highly invasive and spreads rapidly on standing water bodies thereby cutting off the oxygen supply for the aquatic organisms and competing with the native species for nutrients and oxygen.
Steller’s sea cow is an extinct animal which was wiped off the surface of earth because of overkilling and hunting by humans.
Steller’s sea cowSuggest Corrections
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