Question

The smallest structural and functional unit of life is

• A. Organ
• B. Cell
• C. Tissue
• D. Organ system

Answer 1

The correct option is B Cell

• The cell is the smallest structural and functional unit of living organisms, which can exist on its own. Therefore, it is sometimes called the building block of life. Cell theory has 3 basic points.

• All living things are made of cells.
• The cell is the smallest living thing that can perform all the functions of life.
• All cells must come from pre-existing cells. Hence option B is correct.