Chapter – 13 Sound Sound: Vibrations that travel through the airor another medium and can be heard when they reach a person's or animal's...

Chapter – 15 Some Natural Phenomena Some objects can be charged by rubbing with other objects. There are two kindsof charges — positive...

Chapter – 9 Reproduction in Animals Reproduction is a process in which theorganisms produce theyoung ones oftheir own kind. There are...

Chapter – 10 Reaching the age of Adolescence Humans become capable of reproduction after puberty setsin. Between theages of 11years and...

Chapter – 18 Pollution of Air and Water Pollution: An undesirable change in the physical, chemical or biological characteristics ...

Chapter – 2 Micro-organisms: Friend and Foe Micro-organisms: Micro-organisms aretoo small andare not visible to the unaided eye. Theycan...

Chapter – 4 Materials: Metals and Non-Metals Metals arestrong and durable. Thus metals areused so widely for making almost everything...

Chapter – 16 Light Light: The natural agent that stimulates sight and makesthings visible. Lightis reflected from allsurfaces. It isa...

Chapter – 12 Friction Friction is a force thatopposes the relative motion between twosurfaces of objects in contact. Theforce of friction...

Chapter – 11 Force and Pressure Force: A push ora pull, thatchanges or tendsto change thestate of restor of uniform motion of anobject or...

Chapter – 1 Crop Production and Management In order toprovide food fora large population - regular production, proper management and...

Chapter – 7 Conservation of Plants and Animals Biodiversity: Occurrence of innumerable number of different types of organisms and the...

Chapter – 6 Combustion and Flame Combustion: Theprocess of burning a substance inthe presence ofair (oxygen) andundergoes a chemical...

Chapter – 5 Coal and Petroleum Natural Resources: Resources include everything provide by thenature. They form the wealth of a country....

Chapter – 14 Chemical Effects of Electric Current Materials through which electric current can pass through easily are called ...

Chapter – 8 Cell — Structure and Functions Cell: The smallest structural and functional unit of anorganism, which istypically microscopic...

Chapter – 7 Weather, Climate and Adaptations to Climate Weather: Weather is theday-to-day condition ofthe atmosphere ata place influenced...

Chapter – 16 Water: A Precious Resource Water is essential for all living beings. No onecan imagine lifewithout water. Water exists in...

Chapter – 18 Waste water Story Waste water: Black-brown water whichis rich in lather , mixed withoil that goesdown the drains from skins,...

Chapter – 11 Transportation in Animals andPlants Transportation inanimals: In most of the animals the blood that circulates in the body ...

Chapter – 9 Soil Soil is the uppermost crust that covers the earth. It is a mixture of rock particles and humus. Soil is important for...

Chapter – 10 Respiration in Organisms Respiration isessential for survival of living organisms. It releases energy from the food. The...

All organisms multiplyor reproduce offspring of their own kind. In plants there are two modes of reproduction, namely (a) Asexual and (b)...

Chapter – 6 Physical andChemical Changes Changes can beof two types, physical and chemical. 1. Physical changes are changes in the...