Question

Why is cell called a structural and functional unit of life?

Answer 1

Cell is the structural & functional unit of life because all living organisms are made up of cells and these cells perform all the functions essential for the survival of the organis. For example - resiration, digestion etc.
In unicellular organisms a single cell carries out all these functions and in multicellular organisms diff. groups of cells carry out diff. functions.

Answer 2

Cells are called structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells.