Q. No.Fossil records suggest that
(1) Large scale of loss of species have happened earlier even before humans appeared on Earth
(2) Large scale of loss of species have happened earlier within 1000 years of human evolution
(3) Large scale of loss of species have happened earlier just after humans appeared on Earth
(4) Large scale of loss of species have happened within 100 years of human evolution.
(1) Large scale of loss of species have happened earlier even before humans appeared on Earth
(2) Large scale of loss of species have happened earlier within 1000 years of human evolution
(3) Large scale of loss of species have happened earlier just after humans appeared on Earth
(4) Large scale of loss of species have happened within 100 years of human evolution.
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
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
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
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
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
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
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
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
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