Discussion
Life zone system used for classifying vegetation formation, based on a gradient of mean annual biotemperature with latitude and altitutde, percentage precipitation and evapotranspiration was proposed by :
Answer: A
The life zone system was proposed by Holdridge.
Leslie Holdridge published it in 1947. It classifies vegetation formations by three climatic variables, mean annual biotemperature, annual precipitation and the ratio of potential evapotranspiration to precipitation, drawn on logarithmic axes as a triangle of hexagons, with latitudinal regions and altitudinal belts along the sides.
Robert Whittaker (printed 'Wittakar') is known for his biome diagram of temperature against precipitation, Frederic Clements for the theory of succession and the climax, and Eugene Odum for ecosystem ecology. None devised the life zone system.
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