All living organisms consist of cells. Some organisms are unicellular, like bacteria, while others are multicellular, like plants and animals. Cells combine to form tissues organs and systems, forming complete living bodies.
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A cell multiplies through cell division. In this process, a parent cell divides to form new daughter cells. This helps in growth, repair of tissues and reproduction in living organisms.
A cell is the structural unit because it forms the body of organisms. It is the functional unit because all life processes like respiration, digestion and growth occur within cells independently.
Technological tools like microscopes have enabled scientists to study cells beyond the naked eye. Light and electron microscopes provide magnification and clarity, helping observe cell structure organelles and detailed processes accurately.
A cell comes from pre-existing cells through cell division. According to cell theory, new cells are formed only by division of existing cells. This process ensures growth, repair and reproduction in living organisms.