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The Fundamental Unit of Life Notes CBSE Class 9 Ch 5

The Fundamental Unit of Life Notes CBSE Class 9 Ch 5

Cell Cell (Discovered by Robert Hooke) is called as the structural and functional unit of life because All living organisms are made up of cells. All the activities performed by a living organism are sum total of activities performed by its cells. Examples: Nerve Cell, Sperm, Ovum, Fat cell, Bone cell, etc. Cell Theory (By Schleiden & Schwann) All the plants and animals are composed of cells. All cells arise from pre-existing cells. Plasma Membrane (Cell Membrane) (Selectively Permeable Membrane)…

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Matter in Our Surroundings Notes CBSE Class 9 Ch 1

Matter in Our Surroundings Notes CBSE Class 9 Ch 1

Physical Nature of Matter Matter is made up of very small Particles Characteristics of Particles of Matter Particles of matter are continuously moving, i.e., they possess kinetic energy. Kinetic Energy of the particles increases with the increase in temperature. Particles of matter attract each other. States of Matter Due to variation in the characteristics of particles of matter, the matter exists in three states. Solid Liquid Gas Water exists in three states Solid, as Ice Liquid, as Water Gas, as…

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