Extinction of Stellar’s sea cow and passenger pigeon was due to:

1. Habitat loss and fragmentation 2. Over exploitation
3. Invasion of alien species 4. Co-extinctions

Subtopic:  Loss of Biodiversity |
 81%
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What exotic introduction is threatening indigenous catfishes in our rivers?

1. Carassius auratus 2. Carcinus maenas
3. Centaurea solstitialis 4. Clarias gariepinus
Subtopic:  Loss of Biodiversity |
 85%
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Introduction of Lates niloticus led to the extinction of:

1.Gambusia2.Pupfish
3.Cichlid fish4.Chinook salmon

Subtopic:  Loss of Biodiversity |
 71%

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Loss of biodiversity may lead to all except:

1. decline in plant production
2. increased resistance to environmental perturbance
3. increased variability in water use
4. increased variability in pest and disease cycle
Subtopic:  Loss of Biodiversity |
 71%
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The main difference between the “Sixth Extinction” and the previous five extinctions is that the sixth extinction:
1. is mainly occurring on islands
2. is mainly affecting plants
3. is occurring at a faster rate
4. does not involve human activities

Subtopic:  Loss of Biodiversity |
 84%
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Which group, amongst the following, has the maximum percentage of species facing threat of extinction?

1.  Amphibians 2.  Birds
3.  Mammals 4.  Gymnosperms
Subtopic:  Loss of Biodiversity |
 76%
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Which of the following species of tiger has not gone extinct?

1.  Bali 2.  Javan
3.  Caspian 4.  Siberian
Subtopic:  Loss of Biodiversity |
 88%
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The largest carnivorous marsupial that got extinct in 20th century was:
1. Dodo
2. Quagga
3. Thylacine
4. Stellar’s sea cow

Subtopic:  Loss of Biodiversity |

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Year-to-year variation shown by areas with more species is ................... with respect to areas with less species.

1.less2.more
3.same4.absent

Subtopic:  Importance of Biodiversity |
 68%
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The rivet popper hypothesis was given by:

1.  Humboldt 2.  Ehlrich
3.  Tilman 4.  Tansley

Subtopic:  Importance of Biodiversity |
 81%
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