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3 maj 2024 · The notes also explain the parts of a cell, like the outer layer called the plasma membrane, the jelly-like substance inside called cytoplasm, and the control center called the nucleus. By studying these notes, you’ll get a better idea of how cells function and why they are so important in biology.
Unicellular organisms are capable of (i) independent existence and (ii) performing the essential functions of life. Anything less than a complete structure of a cell does not ensure independent living. Hence, cell is the fundamental structural and functional unit of all living organisms.
They may be polygonal, disc-like amoeboid, thread-like, cuboid or irregular. The cell shape is always related and vary with the function they perform. (i) All living organisms are composed of cells and their products. (ii) All cells arise from pre-existing cells. (iii) Cells show similarity in chemical composition and metabolic activities.
The cell wall is mostly found in plant and fungal cells that provide shape to the cell. It also protects the cell against mechanical damage or infection and also prevents the entry of unwanted macromolecules.
From Class 11 Bio Ch 8 notes, you will learn that a rigid non-living structure comprises the outer covering for the plasma membrane of fungi and plants are known as the cell wall. The function of the cell wall is to give shape to the cell and to protect the cell from mechanical damage and infection.
29 lip 2024 · Class 11 Biology NCERT Notes for Chapter 8 Cell The Unit of Life: Cells are the basic units of life and serve as the building blocks of all living organisms. They differ in structure, composition, and function, but have similarities.
