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Class 12 Biology Practice Test: Biodiversity and Conservation - Causes of Biodiversity Losses
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Class 12 Biology Practice Test: Biodiversity and Conservation - Causes of Biodiversity Losses
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15 Questions

1. What are the excess and the unsustainable use of resources called?
2. Why was the African catfish Clarias gariepinus introduced?
3. Which of the following contains chemicals like parthenin, is toxic to cattle and cause pollen allergy in humans?
4. Which one of the following is said to be the most important cause or reason for the extinction of animals and plants?
5. What is Eicchornia called?
6. What happens when alien species are introduced unintentionally or deliberately?
7. Which animals are badly affected when a large habitat is broken up into small fragments due to various human activities?
8. Which phenomenon does the coevolved plant-pollinator mutualism explain?
9. Which phenomenon explains that ‘When a species becomes extinct, the plant and animal species also become extinct that are obligatorily associated with the host species’?
10. What was the reason for the exploitation of the Steller’s sea cow and the passenger pigeon?
11. What is Eicchornia called?
12. Which phenomenon does the coevolved plant-pollinator mutualism explain?
13. Which of the following contains chemicals like parthenin, is toxic to cattle and cause pollen allergy in humans?
14. What happened when the Nile perch introduced into Lake Victoria in east Africa?
15. What happened when the Nile perch introduced into Lake Victoria in east Africa?

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