Showing posts from August 19, 2018
Soil Mixture of rocks particles, sand and humus is known as soil. Soil supports the growth of plants by holding their roots and supplying water to them. Formation of soil: Soil is formed by w…
Wind Storm Air: Air is a mixture of gases. Wind: Moving air is called wind. Air exerts pressure: The fact that Air exerts pressure can be understood by many examples. Tube of bicycle get…
Weather Climate Weather: The day to day condition of atmosphere at a particular place is called weather. The weather can be comfortable, or can be too hot or cold. Weather Report: The daily…
Physical and Chemical Changes We see different types of changes; every day in our surrounding. Growth of tree, rising of sun, setting of sun, different shape and size of moon, burning of coal, p…
Acid Base Salt Substances can be divided into three types – Acid, Base and Salt. ACID: Taste of acid is sour. There are many substances that contain acid and so taste sour. For example – lemon…
Heat Heat is the transfer of energy from a hot body. The sense of touch can be used to understand the degree of hotness or coldness of something. But the sense of touch is not reliable and canno…
Animal fibres → Wool and silk fibres are obtained from animals. → Wool is obtained from the fleece (hair) of fleece sheep or yak. Silk fibres come from cocoons of the silk moth. Wool → Woo…
Introduction In the previous chapter we learned that plants can prepare their own food by photosynthesis but animals cannot. Animals get their food from plants, either directly by eating plant…
Introduction All living organisms such as plants and animals require food. So food is essential for all living organisms. Plants are capable of making their food themselves but humans and an…
Solid Liquid & Gas Fig:States of Matter Solid: Solid has definite shape and definite volume. Examples: Stones, wood, plastic, common salt, steel, ice, glass, etc. Liquid: Liquid h…
Human beings exhibit locomotion. Locomotion is brought about by the combination of muscular and skeletal system. The bending and movement of the skeleton is brought about by special structures cal…
Getting to Know Plants Plants can be classified on the basis of their height, stem and branches. On these parameters, plants can be of three types, viz. herbs, shrubs and tree. Herbs: Herb…