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Population density is the number of persons living in 1 square kilometre of area. It can be measured in terms of number as well as in terms of biomass (or per cent cover). But the population in terms of number is not always a necessary parameter to measure population density. This can be explained by the following examples:
1. If we compare 200 Parthenium plants and a single huge banyan tree, the banyan tree contributes more to density as it produces much more biomass.
2. Similarly, if we compare the population of Chlamydomonas in the pond (in millions) and a single, huge banyan tree, the banyan tree contributes more to density as it produces much more biomass. Here, population density in terms of biomass gives a more appropriate measurement of population density.
Hope this helps you clear your doubts regarding the topic.