Conceptual Understanding of Science
“Genius is one percent inspiration – and ninety nine percent perspiration”
– Thomas Alva Edison
THE FUNDAMENTAL UNIT OF LIFE CHAPTER 5 CLASS IX
CELL- The structural and functional unit of organism is called ‘cell’. Cells are similar to the bricks of a wall. The cells form the body of an organism. All the functions of the organisms are performed by the cell. Different group of cells perform different functions. A group of cells that have common origin and function is called ‘tissue’. E.g. -Nervous tissue, Bone tissue, Muscular tissue, Blood tissue etc. The study of tissue is called ‘histology’.
CHAPTER 13 CLASS 8, Key Learning Points- Vibrations, Larynx (Voice box), Medium of sound propagation, Human ear, Properties of sound- Amplitude, Time period and Frequency, Audible range of sound, Noise and music , Noise pollution
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