GENERAL HISTOLOGY

Detailed explanation-1: -The correct option is B A cell. Cell is the smallest structural and functional unit of an organism. Each cell of an organism performs functions such as nutrition, transport, excretion and reproduction.

Detailed explanation-2: -All living things are made of cells (Figure 3.3. 1); the cell itself is the smallest fundamental unit of structure and function in living organisms.

Detailed explanation-3: -A cell is capable of carrying out all life processes, such as nutrition, excretion, respiration, etc. Hence it is called as the functional unit of life. The cell is the smallest unit of life and all the living beings are made up of cells. Hence a cell is called the structural unit of life.

Detailed explanation-4: -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. Some organisms, such as bacteria or yeast, are unicellular-consisting only of a single cell-while others, for instance, mammalians, are multicellular.