Biodiversity and Conservation
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How do ecologists estimate the total number of species present in the world?

The ecologists estimate the total number of species present in the world using the statistical methods because the number of species is too large .  They make statistical comparisons of the temperate-tropical species richness of an exhaustively studied group of insects and extrapolate this ratio to other groups of animals and plants and come up with a gross estimate of the total number of species on earth
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    The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification?

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    Give three hypotheses for explaining why tropics show greatest levels of species richness.

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    Name the three important components of biodiversity.
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    Among the ecosystem services are control of floods and soil erosion. How is this achieved by the biotic components of the ecosystem ?
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