When is it not necessary to know the absolute population density?

When is it not necessary to know the absolute population density?
  1. When the per cent cover or biomass is a more meaningful measure
  2. When the relative density serves the purpose equally well
  3. When the population is huge and counting is impossible or very Time Taken:consuming
  4. When the number of fish caught per trap is a good enough measure of its total population density

Solution

It is not necessary to know the absolute population density when the relative density serves the purpose equally well, for instance when the number of fish caught per trap is a good enough measure of its total population density in the lake.

Asked in: NCERT

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