Concise Biology Class 9 ICSE Solutions for Chapter 2 - Cell: The Unit Of Life

A cell is a small, self-contained unit of life. It is the smallest structural and functional unit of life on Earth. It plays a major role in the field of biology and represents the basic structural, functional and physiological units of all known living organisms. A cell is a small unit that contains substances necessary for sustaining life. It is the smallest structural and functional unit of life on Earth. A group of similar cells join to form tissues, and tissues join together to form organs Organs, in turn, work together to carry out an organism's special functions at different levels.

What is Cell Structure?

All living organisms are made of one or more cells, which are the basic units of life. Single-celled organisms include bacteria and blue-green algae (cyanobacteria). While most multicellular organisms have both a tissue level and an organ level of organization, all cells come from the division of another cell. The nucleus is surrounded by a membrane, which separates its content from the outside environment. Mitochondria are organelles that release energy for the cell's requirements and store some of it in the form of ATP (adenosine triphosphate) molecules that act as a form of energy. Membrane-bound organelles are enclosed in the membrane, while other structures are not enclosed in membranes; this includes ribosomes, endoplasmic reticulum (ER), Golgi apparatus and lysosomes.

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