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Carbon and its Compounds| Ch-4 Class 10 SCIENCE Quick Revision Notes | NCERT CBSE | Edugrown

Carbon and its Compounds | Ch-4 Class 10 Science Quick Revision Notes

 Carbon is tetravalent, it does not form ionic bond by either losing four electrons (C4+) or by gaining four electrons (C4-). It is difficult to hold four extra electron and would require large amount of energy to remove four electrons. So, carbon can form bond by sharing of its electrons with the electrons of other carbon atom or with other element and attain noble gas configuration.

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Acids, Bases and Salts| Ch-2 Class 10 SCIENCE Quick Revision Notes | NCERT CBSE | Edugrown

 Acids, Bases and Salts | Ch-2 Class 10 Science Quick Revision Notes

 Other natural materials like red cabbage leaves, turmeric, coloured petals of some flowers such as Hydrangea, Petunia and Geranium, which indicate the presence of acid or base in a solution.

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Chemical Reactions and Equations| Ch-1 Class 10 SCIENCE Quick Revision Notes | NCERT CBSE | Edugrown

 Chemical Reactions and Equations | Ch-1 Class 10 Science Quick Revision Notes

  In certain other changes the new substance formed in which the reactant or the parent loses its identity to form new substance called a product. These changes are permanent changes as we won’t get the reactant back.

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Improvement in Food Resources | Ch-15 Class 9 Biology Quick Revision Notes | NCERT CBSE | Edugrown

 Improvement in Food Resources | Ch-15 Class 9 Biology Quick Revision Notes

  This can be done by farming on more land but India is already intensively cultivated. Hence, it is necessary to increase the efficiency of production for both crops and livestock.

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Natural Resources | Ch-14 Class 9 Biology Quick Revision Notes | NCERT CBSE | Edugrown

Natural Resources | Ch-14 Class 9 Biology Quick Revision Notes

  Various nutrients are used again and again in a cycle fashion. This leads to a certain balance between the various components of the biosphere.

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Why Do We Fall ill | Ch-13 Class 9 Biology Quick Revision Notes | NCERT CBSE | Edugrown

Why Do We Fall ill | Ch-13 Class 9 Biology Quick Revision Notes

  The diseases/infections can be prevented by life style (exercise, proper sleep, enough relaxation) modification, taking a balanced diet, good personal health and hygiene and also maintaining a clean and healthy surrounding.

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Work and Energy | Ch-11 Class 9 Physics Quick Revision Notes | NCERT CBSE | Edugrown

Work and Energy | Ch-11 Class 9 Physics Quick Revision Notes

  The energy for the ‘life processes’ comes from food. Activities like playing, singing, reading, writing, thinking, jumping, cycling and running requires energy.

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Gravitation | Ch-10 Class 9 Physics Quick Revision Notes | NCERT CBSE | Edugrown

Gravitation| Ch-10 Class 9 Physics Quick Revision Notes

  The stone is when accelerated towards earth, means some force is acting on it. The force which pulls the objects towards the centre of the earth is known as gravitational force of the earth.

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