Why is the cell called the structural and functional unit of life Class 9

A cell is called the structural and functional unit of life because it is the smallest unit that can carry out all the processes necessary for life. Cells are the building blocks of all living organisms, meaning they form the structure of our bodies. Every part of a living being, including organs and tissues, is made up of cells. Therefore, they are called the structural units of life. In addition to providing structure, cells perform all vital functions needed for survival. These functions include nutrition (taking in and processing food), respiration (producing energy), excretion (removing waste), and reproduction (creating new cells). Because they carry out these essential activities, cells are known as the functional units of life. Cells can exist independently and perform all these functions on their own, especially in unicellular organisms like bacteria, which consist of just a single cell. In multicellular organisms like humans, cells are specialized to perform specific tasks, but they still work together to keep the organism alive. Moreover, cells are involved in all physiological, biochemical, genetic, and metabolic activities within an organism. This is why they are fundamental to both the structure and function of all living beings. Additionally, the largest cell in the human body is the ovum or egg cell in females, which is much larger than sperm cells. In summary, cells are called the structural and functional units of life because they are the smallest units that make up all living organisms and perform all necessary life processes.