Which of the following mass extinction is going on

(1) 5th

(2) 6th

(3) 4th

(4) 7th

Subtopic:  Loss of Biodiversity |
 89%
From NCERT
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More than …a…..was the time period during which …b….mass extinction has taken place

(1) a- more than three billion years

(2) a- more than 4.5 billion years

(3) b- six extinctions

(4) Both A and C

Subtopic:  Loss of Biodiversity |
From NCERT
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Sixth Extinction presently in progress is different from the previous episodes by some reasons except

(1) Difference in the rates

(2) Current rate is 100-1000 times faster than previous episodes

(3) Human intrusions

(4) Extinction of special bird species

Subtopic:  Loss of Biodiversity |
 56%
From NCERT
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Which of the following can be an alarming consequence of sixth extinction?

(1) Nearly half of all the species on Earth can be wiped out within the next 100 years

(2) Nearly one fourth of all the species on Earth can be wiped out within 200 years

(3) Nearly one eighth of all the species on Earth can be wiped out within 100 years

(4) Nearly one third of all the species on Earth can be wiped out within 200 years

Subtopic:  Loss of Biodiversity |
 84%
From NCERT
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Which of the following is not a result of loss of biodiversity?

(1) Decline in plant production

(2) Lowered resistance to environmental perturbations such as drought

(3) Increased variability in certain ecosystem processes such as Plant Productivity

(4) Decreased variability in certain ecosystem processes such as pest and disease cycle

Subtopic:  Loss of Biodiversity |
 60%
From NCERT
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Which of the following is not a part of Evil Quartet?

(1) Habitat loss and Fragmentation

(2) Dosage compensation

(3) Alien Species Invasions

(4) Co-extinctions

Subtopic:  Loss of Biodiversity |
 93%
From NCERT
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The most important cause driving animals and plants to extinction in the Evil Quartet is

(1) Habitat loss and Fragmentation

(2) Over-Exploitation

(3) Alien Species Invasions

(4) Co-extinctions

Subtopic:  Loss of Biodiversity |
 94%
From NCERT
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Which of the following give the most dramatic examples of habitat loss?

(1) Tropical Rain forest

(2) Temperate Deciduous forest

(3) Temperate Evergreen forest

(4) Grasslands

Subtopic:  Loss of Biodiversity |
 91%
From NCERT
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Once covering more than ……. of  the Earth's land surface, these rain forests now cover no more than……

(1) 17,10

(2) 14,6

(3) 12,4

(4) 7,3

Subtopic:  Loss of Biodiversity |
 88%
From NCERT
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Amazon Rain Forests

Which of the following is wrong?

(1) Huge and called lungs of Planet

(2) Harbour millions of species

(3) Amazon forests were being cut and cleared for cultivation of Brassica

(4) Conversion to grasslands and for raising beef cattle among the other reasons for cutting of Amazon forests

Subtopic:  Loss of Biodiversity |
 89%
From NCERT
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