Is banana a tree or shrub?

Answer 1

Well... you could've asked more specific.. =P Bananas are neither, they are a fruit.

But the answer of what you are trying to say is: Bananas are a flowering plant, often mistaken for trees.

Answer 2

The banana plant is the largest herbaceous flowering plant, a monocotyledonous flowering plant.

Plants are normally tall and fairly sturdy and are often mistaken for trees

Answer 3

A tree.