Important points to remember : Contamination  of  natural  environment  that  will  be  harmful  to  ecosystems  is  called as pollution.  Many problems have been arisen on…

Important points to remember : Gold, silver,  iron,  copper, aluminium,  magnesium,  calcium,  sodium, platinum  are a few metals.  Metals are good conductors of heat and…

Important points to remember :  Matter  is classified into three types  ‘element’, ‘compound’ and ‘mixture’  by considering whether the smallest  particles  of matter  are similar …

Important points to remember : The concept of atom is more than 2500 years old. However, it was forgotten in the course of time.   In…

Important points to remember : This electric  level  deciding the direction  of flow of electric  charges is called electrostatic potential.  Potential difference  :  Similar to…

Important points to remember : a force is applied between two objects even if the two objects are not in contact,  such a force  is…

Important points to remember : Health  is a state  of complete  physical,  mental and  social  well-beingness  and  not  merely  the absence of any disease.  Condition…

Important points to remember : The process of dividing  living  organism into groups and subgroups is called  Biological classification.  Carl Linnaeus in 1735 divided living…

Important points to remember : Our solar system is a tiny part of a galaxy called  the Milky Way, which is many, many times larger…

Important points to remember : Magnets are made from alloys of iron, cobalt and nickel.  Nipermag, an alloy of iron,  nickel,  aluminium  and titanium  is…

Important points to remember : Sound  is generated by the rhythmic vibration of an object.  We can hear the sound as long as the object…

Important points to remember : Eclipses often occur in the solar system. As  seen from the earth, when a planet or a star passes behind …

Important points to remember : Metals are obtained  from their ore by extraction and purification. Impurities of  sand and  soil in an  ore are called …

Important points to remember : In the period prior to 500 BC, in countries such as  China, Greece, Rome, toothpaste  was made  by mixing  the…

Important points to remember : Many kinds of matter  found in nature are in pure form, that is, they contain only one constituent. In scientific…

Important points to remember :  Changes like  the  ripening of a fruit, spoiling of milk occur naturally. These are called  natural changes.  Many changes such…

Important points to remember : There  are more than 600 muscles  in the human body. Muscles contribute almost 40% of the weight of a healthy …

Important points to remember : cell  is the fundamental  structural  and functional  unit of living  organisms. In 1665, a scientist,  Robert  Hooke observed a thin…

Important points to remember : We have studied two types of disasters, namely, manmade and  natural disasters.  Natural disasters such as famine, lightning strikes, cloudbursts,…