Class VIII Science

INTRODUCTION-In our daily life we come across many objects and materials. These objects are different from each other in appearance and hardness. Those objects which are very hard and have shiny appearance are generally objects made up of metals. Those objects which are not very hard and dull in appearance are made up of non-metals. […]

SYNTHETIC FIBRES AND PLASTICS Chapter 3 Class VIII (C.B.S.E.) Key Learning Points– Introduction, Synthetic fibres, Polymers, Characteristics of Synthetic fibres, Types of synthetic fibres and their uses, Plastic, Types of plastics- thermoplastics and thermosetting plastics, Characteristics of synthetic fibres or plastic, Plastic and environment. Plastics Articles INTRODUCTION-The thin thread which is made up of natural

MICROORGANISMS: FRIEND OR FOE?    Chapter 2   Class VIII Introduction– Those organisms which can only be seen by using microscope are called microorganisms or microbes. e. g-Bacteria, Viruses, Protozoa, Algae, etc. Microbes are useful to us as well as harmful. Many of them cause diseases in plants and animals. Many of the spoil the food, therefore,

 INTRODUCTION– Early people were nomadic. They wander from one place to another for food and shelter. They were depended on raw fruits, roots, vegetables, leaves and hunted animals as food. About 10000 B.C., they started to cultivate land by settling near the crop fields and produced Rice, wheat, and other food crops. Thus, they learnt