Class 09 Science

Life on Earth is powered by a constant flow of energy and matter. The Sun is the main source of

The Earth is home to an enormous variety of life forms. This immense variety of living

Every organism has a definite life span - it is born, grows, matures, reproduces and eventually

Sound is produced by vibrations. Vibration refers to the periodic to and fro motion

Many properties of the elements are not retained when they form a compound. For example,

Matter consists of tiny particles called atoms. In 1808,

Work is done by a force on an object, when the force displaces the object in the direction of

A force can make an object move from rest, change the speed and direction of

Mixtures are classified as homogeneous or heterogeneous and also as solutions, suspensions, or

Everything in nature is in motion, from massive astronomical objects to subatomic particles.

Life begins when a single cell divides itself several times to give rise to a large number of

The cell is the basic structural and functional unit of all living organisms. All living