Which of the following is not correct according to analogy given by Paul Ehrlich?

1. Loss of the key species that drive the major ecosystem functions is a more serious threat to flight safety than loss of other less important species
2. Proper functioning of ecosystem is initially may not be affected by species loss
3. Over a period of time, if the species loss is continuous, the ecosystem gets affected after a time
4. Even the loss of not much significant species lead to critical damage to ecosystem.

Subtopic:  Importance of Biodiversity |
 65%
From NCERT
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The colonisation of tropical Pacific Islands by humans is said to have led to the extinction of more than

(1) 5000 species of native birds

(2) 2000 species of native birds

(3) 1500 species of mammals

(4) 3500 species of mammals

Subtopic:  Loss of Biodiversity |
 74%
From NCERT
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Which of the following data is not according to IUCN Red List (2004)?

(1) Vertebrates-338

(2) Invertebrates-359

(3) Plants-87

(4) Bacteria-104

Subtopic:  Loss of Biodiversity |
 83%
From NCERT
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The extinctions of 784 species recorded in IUCN Red List (2004) happened over

1. Last 240 years

2. Last 500 years

3. Last 300 years

4. Last 400 years

Subtopic:  Loss of Biodiversity |
 88%
From NCERT
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Which of the following is wrongly matched (with respect to recent extinction)?

1. Dodo-Mauritius

2. Quagga-Africa

3. Thylacine-Australia

4. Steller's Sea Cow- Stanford

Subtopic:  Loss of Biodiversity |
 93%
From NCERT
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Which of the following is not recently extincted subspecies of tiger?

(1) Bali

(2) Javan

(3) Caspian

(4) Sumata

Subtopic:  Loss of Biodiversity |
 93%
From NCERT
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The last twenty years or so have witnessed the disappearance of at least

(1) 27 species

(2) 40 species

(3) 12 species

(4) 7 species

Subtopic:  Loss of Biodiversity |
 87%
From NCERT
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Which of the following is not correct regarding the extinction of species?

(1) Some groups like fishes appear to be more vulnerable to extinction

(2) More than 15500 species worldwide are facing the threat of extinction

(3) Presently, 12 percent of all bird species in the world face the threat of extinction.

(4) Both (2) and (3)

Subtopic:  Loss of Biodiversity |
 62%
From NCERT
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Which of the following is not correct regarding vulnerability data of different groups?

(1) Birds-12 per cent

(2) Mammals- 23 per cent

(3) Amphibians- 27 per cent

(4) Gymnosperms- 31 per cent

Subtopic:  Loss of Biodiversity |
 78%
From NCERT
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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.
Subtopic:  Loss of Biodiversity |
 66%
From NCERT
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