Q. Which among the following biogeographical boundary kept the fauna of Indomalaya ecozone and Australasia Ecozone isolated from one another contributing to the distinctly different fauna of Australasia?
Answer: Strait of Lombok
Notes: Strait of Lombok is part of the biogeographical boundary between the fauna of Indomalaya ecozone and the distinctly different fauna of Australasia. The boundary is known as the Wallace Line, for Alfred Russel Wallace, who first remarked upon the striking difference between animals of Indo-Malaysia from those of Australasia and how abrupt the boundary was between the two biomes.

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