Body movements are made possible by the coordination between bones, joints and muscles. Movements of body can be :voluntary and involuntary.

An object may change in shape, position, size, colour, state and internal structure. Changes involve enegy which may be in the form of heat, light or pressure. 

Food povides various nutrients for the growth, function and maintenance of our body. The major nutrients are carbohydrates, proteins, fats vitamins and minerals. 70% mass of our body is water.

Fibres are of two types: Natural fibres i.e. flax, cotton, silk, wool and Synthetic fibres i.e. polyster, nylon, acrylic.

Light enables us to see different objects. A shadow is formed when an opaque object obstructs the path of light rays. A mirror bounces off light rays and changes their path. this phenomenon is called reflection of light.

All living organisms show some common characteristics such as need for food, growth, respiration, response to stimulus, exceretion, movement and reproduction.

An object that has the unique property to attract iron and some other material is known as magnet. Every magnet has two pole- North pole and South pole. Like poles repel whereas as unlike poles attract.

The process of travelling and moving people or goods from one place to another is called transportation. The process of finding out how many measuring units are there in an objects in known as measurement. Motion occurs when an object changes its relative location in space.

Plants can be categorised into herbs, shrubs, trees, creepers and climbers. A plant body can be divided into two main systems i.e. shoot system and root system. 

The types of particles present in a form of matter helps determine whether it is pure or impure. Pure substance can be elements or compounds whereas impure substance can be heterogeneous or homogeneous in nature. Seperation of substance is necessary to remove undesirable and useless components, to obtain useful components and to get pure substances.

An object can be made using different matrial and one material can be used for making different objects. Materials can be man-made or natural. Seperating different objects into various groups on the basis of some common property is called sorting of materials into groups.

Food can be obtained from plants and animals. Stems, leaves, roots, fruits, seeds and flowers are used as food. Animals can be categorised as herbivores, carnivores, omnivores, scavengers and parasites depending on their food habits. A food chain shows who eats whom. Cooking food makes food soft, tasty and easy to digest.