Select the most appropriate statement from the following.

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Population density is always measured in numbers only.

The biomass of one banyan tree is low relative to that of ten carrot grass plants.

Ecological investigations are always based on absolute population densities.

The tiger census is often based on pug marks and faecal pellets.

answer is D.

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Detailed Solution

The tiger census in our national parks and tiger reserves is often based on pug marks and faecal pellets.

Population density need not necessarily be measured in numbers only.

In an area, if there are 200 carrot grass (Parthenium hysterophorus) plants but only a single huge banyan tree with a large canopy, stating that the population density of banyan is low relative to that of carrot grass amounts to underestimating the enormous role of the Banyan in that community.

Sometimes, for certain ecological investigations, there is no need to know the absolute population densities; relative densities serve the purpose equally well.

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