A small limited habitat within a larger, more extensive habitat is called a microhabitat.
With regard to the assertion and reason, choose the correct option:
Assertion [A]: Rainforests show high biodiversity.
Reason [R]: Rainforests have a large number of microhabitats.
Rainforest is a highly heterogenous habitat; it consists of the canopy, understory and forest floor. Each of these layers offers many microhabitats, enabling the growth and development of many diverse species.