How do ecologists estimate the total number of species pres…

Biology Biodiversity and Conservation Biodiversity and It's Conservation Single Correct MCQ

Published on: August 13, 2026

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

By counting them all.

By counting the number of any one species and applying this to various genus.

By making statistical comparison of the temperate–tropical species richness of an exhaustively studied group of insects and extrapolating this ratio to other group of animals and plants.

By calculating biomass of all the species.

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The correct answer is:

Ecologists estimate total species by studying a well-known group (like insects), comparing tropical vs temperate species richness, and then extrapolating (applying) this ratio to other groups.

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