At which level is ecological diversity observed?

Select the incorrect statement regarding the plant $Rauwolfia$ $vomitoria$.

Study the following statements and select the correct option given below:
Statement-$I$: Biodiversity is the variety of features of life observed in the living organisms at different levels within a defined area.
Statement-$II$: Living organisms' attempt to accommodate with different environmental conditions forms the basis of diversity.

The number and types of organisms present on Earth refer to:

Which sample area shows maximum diversity?

Select the correct option regarding species diversity.