CBSE Class 9 Science Chapter 15 Notes Improvement in Food Resources Improvement in Food Resources Class 9 Notes Understanding the Lesson 1. The population of India is more than one billion people, and it is still growing. So, the need of the hour is to increase the food production. This can be done by farming…
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CBSE Class 9 Science Chapter 14 Notes Natural Resources Natural Resources Class 9 Notes Understanding the Lesson 1. Natural resource: Any substance or material derived from nature that humans can use for their benefit. The resources on the Earth are land, water and air. 2. The outer crust and the upper mantle of the Earth…
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CBSE Class 9 Science Chapter 13 Notes Why Do We Fall ill Why Do We Fall ill Class 9 Notes Understanding the Lesson 1. Cells are basic unit of living organisms and a lot of activities and chemical reactions are taking place in the cells, so even though they look static they are in a…
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CBSE Class 9 Science Chapter 12 Notes Sound Sound Class 9 Notes Understanding the Lesson 1. Sound Sound is a form of energy which produces a sensation of hearing in our ears. 2. Production of sound Sound is produced by vibration of objects. The sound of human voice is produced due to vibration in the…
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CBSE Class 9 Science Chapter 11 Notes Work, Power And Energy Work, Power And Energy Class 9 Notes Understanding the Lesson 1. Work done by a constant force Work done by a force acting on an object is equal to the magnitude of the force multiplied by the distance moved in the direction of the…
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CBSE Class 9 Science Chapter 10 Notes Gravitation Gravitation Class 9 Notes Understanding the Lesson 1. Newton’s law of gravitation “Every particle in the universe attracts every other particle with a force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between the two masses.…
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CBSE Class 9 Science Chapter 9 Notes Force and Laws of Motion Force and Laws of Motion Class 9 Notes Understanding the Lesson 1. Force It is entity which when applied on a body changes or tends to change a body’s state of rest state of uniform motion direction of motion shape 2. Balanced forces…
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CBSE Class 9 Science Chapter 8 Notes Motion Motion Class 9 Notes Understanding the Lesson 1. Rest: A body is said to be at rest if its position does not change with respect to a fixed point taken as a reference point in its surrounding with the passage of time. 2. Motion: A body is…
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CBSE Class 9 Science Chapter 7 Notes Diversity in Living Organisms Diversity in Living Organisms Class 9 Notes Understanding the Lesson 1. What is classification? Grouping the organisms on the basis of their similarities and differences is called classification. 2. Need for classification To provide information regarding diversity of plants and animals on the Earth.…
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CBSE Class 9 Science Chapter 6 Notes Tissues Tissues Class 9 Notes Understanding the Lesson 1. A single cell performs all the basic functions like digestion, respiration, excretion, etc. in order to sustain life in the unicellular organisms like Amoeba. In multicellular organisms like human beings, each specialised function to sustain life is taken up…
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