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NEETBotanyBiodiversity and its Conservation

How do biologists make a gross estimate of the total number of species on Earth?

Options

  1. ABy comparing the species richness of exhaustively studied group of insects
  2. BBy extrapolating the ratio to other groups of animals and plants
  3. CBy using statistical methods
  4. DAll of the above

Correct answer

D. All of the above

Step-by-step solution

For many taxonomic groups, species inventories are more complete in temperate than in tropical countries. Considering that an overwhelmingly large proportion of the species waiting to be discovered are in the tropics, biologists make a statistical comparison of the temperate-tropical species richness of an exhaustively studied group of insects and extrapolate this ratio to other groups of animals and plants to come up with a gross estimate of the total number of species on earth. Some extreme estimates range from 2

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