The Fundamental Unit of Life
Chapter 5 of the Class 9 NCERT Science textbook establishes the cell as the basis of all living structure and function. Learners trace discovery from cork slices to cell theory, then contrast prokaryotic simplicity with eukaryotic organisation. Membranes, nucleus, mitochondria, plastids, endoplasmic reticulum, Golgi bodies, lysosomes, vacuoles and walls are each assigned roles in transport, energy and synthesis. Osmosis and diffusion experiments show membranes as gatekeepers, making the cell a living factory rather than an empty box.
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