FREE NCERT MATERIAL

Acids, Bases and Salts

The sour and bitter tastes of food are due to acids and bases present in them. Acids are sour in taste and change the color

ANIMAL TISSUES

The contraction and relaxation of these cells result in movement. Blood flows and carries various substances from one part of the body to the other.

ATOMS AND MOLECULES

Around 500 B.C., Indian philosopher Maharishi Kanad, postulated the theory if we go on dividing matter (padarth), we will obtain the smallest particle beyond which

Carbon and its Compounds

Compounds are of two types:(i) Organic Compounds(ii) Inorganic Compounds Organic Compounds are made up of Carbons and form the basis of all living organisms. THE

CELL — STRUCTURE AND FUNCTIONS

All organisms are made of smaller parts called organs. Organs are made of still smaller parts. The smallest living part of an organism is a

CHEMICAL EFFECTS OF ELECTRIC CURRENT

Materials, which allow electric current to pass through them, are good conductors of electricity. Materials, which do not allow electric current to pass through them easily,

Chemical Reactions and Equations

Most of the substance around us undergoes various changes. Some of these changes are temporary with no new substance being formed. They are called physical

Coal and Petroleum

Natural Resources Resources include everything provided by the nature. They form the wealth of a country. Types of Natural Resources: (i) Inexhaustible: There are some

COMBUSTION AND FLAME

Combustion is a chemical process in which a substance reacts with oxygen to give off heat. The substance that undergoes combustion is said to be

CONSERVATION OF PLANTS AND ANIMALS

Deforestation and Its Consequences Deforestation: clearing of forests and using that land for other purposes. Consequences: Deforestation increases the temperature and pollution level on the

Control and Coordination

All the living organisms respond and react to changes in the environment around them. The changes in the environment to which the organisms respond and

CROP PRODUCTION AND MANAGEMENT

Introduction All living organisms require food. Plants can make their food themselves whereas animals including humans can not make their own food. Humans get their