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
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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
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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
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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 crtical damage to ecosystem.
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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
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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
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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
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Which of the following is wrongly matched recent extinction?

  1. Dodo-Mauritius
  2. Quagga-Africa
  3. Thylacine-Australia
  4. Steller's Sea Cow- Stanford
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Which of the following is not recently extincted subspecies of tiger?

  1. Bali
  2. Javan
  3. Caspian
  4. Sumata
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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
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