roots that never touch the ground for example orchids
Because orchids are designed to be an aerial type of plants
Aerial roots
the examples of aerial roots is mangroove tree
No
No
aerial
aerial prop roots
An aerial root is an adventitious root which grows from a plant stem above the ground.
Banyan tree
The strangling fig has aerial roots that are found above the ground.
Aerial roots perform a number of functions. They help with air exchange, propagation, stability and nourishment. In many cases, aerial roots can be removed without harm to the plant. In some cases, however, they are essential to the plant's health and best left alone.
Not if they're not green.