Rich biodiversity is not important for

(1) Healthy ecosystem

(2) Survival of human race on this planet

(3) Alien species

(4) Both (1) and (2)

Subtopic:  Importance of Biodiversity |
 79%
From NCERT
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Paul Ehrlich

Which of the following is wrong about him?

(1) Stanford Ecologist

(2) Rivet Popper Hypothesis

(3) Importance of species actually affects the extent of stability of ecosystem

(4) Worked on Outdoor plots for the apology he proposed

Subtopic:  Importance of Biodiversity |
 75%
From NCERT
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David Tilman actually proposed that

1. The long term ecosystem experiments using out door plots with less species showed less year to year variation in total number
2. The long term ecosystem experiments using out door plots with more species showed less year to year variation in total biomass
3. The long term ecosystem experiments using out door plots with more species showed more year to year variation in total number
4. The long term ecosystem experiments using indoor plots with less species showed less year to year variation in total biomass
Subtopic:  Importance of Biodiversity |
 79%
From NCERT
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According to Rivet Popper Hypothesis, which of the following is not correct?

1. Airplane: ecosystem

2. Rivets: species

3. Popping a rivet: causing a species to become extinct

4. Flight safety: number of species

Subtopic:  Importance of Biodiversity |
 85%
From NCERT
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Which of the following loss of rivet will be more crucial for the flight safety?

(1) Loss of rivets on the wings

(2) Loss of rivets on the seats

(3) Loss of rivets on Windows inside the plane

(4) Both A and C

Subtopic:  Importance of Biodiversity |
 75%
From NCERT
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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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