7th Class

EXPONENT AND POWERS   POWER \[\frac{{{a}^{m}}}{{{a}^{n}}}={{a}^{m}}-n\] \[{{5}^{3}}\div {{5}^{2}}={{5}^{3}}-2\]   FUNDAMENTALS

•                   Exponential form is nothing but repeated multiplication.

There are two part of an exponent. Exponent\[\to \]base, Power/ Index                                                             more...

Nutrition   Nutrition in Plants All living beings need food to carry out various life processes. Food gives living beings the material to build and maintain their body. Nutrition is the process by which an organism obtains its food and utilize them. The nutrition can be categorised mainly into two type's namely autotrophic and heterotrophic nutrition.   Autotrophic Nutrition Autotrophic organisms make their own food from simple raw materials available in their environment. Green plants, algae and some bacteria can produce their own food by the process of photosynthesis. The process of photosynthesis occurs only when plants or algae or some bacteria have green pigment, called chlorophyll in their cells. In the process of photosynthesis, the leaves of plants convert water and carbon dioxide into glucose or sugar and oxygen with the help of energy from the sun. Plants take in carbon dioxide from more...

Fibre to Fabric   Fibre Fibre is a long and thin strand of a material. It can be categorised into two type’s namely natural fibre and manmade fibre.   Natural Fibre Natural fibre is derived from plants and animals. Fibres such as cotton, flax and jute are derived from plants. Fibres such as silk and wool are derived from animals.   Plant Fibres The fibres which we get from plants are called plant fibres. Cotton, flax and jute are plant fibres. Cotton: Cotton fibre is obtained from the seeds of the cotton plant. Flax: Flax fibre is soft, lustrous and flexible. It is stronger than cotton fibre but is less elastic. The finer grade of flax fibre is used for producing linen fabrics such as damasks, Lace and sheeting. The coarser grades of flax fibre are used for manufacturing twine and rope. Flax fibre more...

Physical and Chemical Changes Heat Heat is a form of energy and energy is the capacity to do work. This clearly indicates that work can be done with the help of heat.   Temperature The decree of hotness and coldness is called the temperature of the body. The two common scales that are used to measure the temperature of the body are Celsius scale and Fahrenheit scale. On the Celsius scale, the melting point of ice is and boiling point of water is On the Fahrenheit scale, the melting point of ice is  and boiling point of water is more...