Within a region,species richness increases with an increasing explored area,but only up to a limit. Which naturalist proposed this statement?

Which of the following represent the maximum number of species among global biodiversity?

Given below are pie diagrams $I$,$II$ and $III$ related to the proportionate number of species of major taxa of invertebrates,vertebrates and plants respectively. Critically study and fill in the blanks $A, B, C$ and $D$.

In the tropics,the rate of extinction is

Where are the Cardamom Hills located?

Tropical rain forests are found in