NCERT solutions for class 9 Science Chapter 9-Force and Laws of Action Force Push or pull on an object which can be used to • change the magnitude of the velocity of an object • change in motion of an object. •shape and size of… Read More »NCERT solutions for class 9 Chapter 9 – Force and Laws of Action
NCERT solutions for class 9 Science Motion 8.1 Describing motion Change in the position of an object with respect to time is called motion. Example – The motion of a car Birds flying The motion of planets stars and galaxies. 8.1.1-Reference point- The point from… Read More »NCERT solutions for class 9 Science chapter 8 Motion
NCERT solutions for class 9 science Chapter – 7 Diversity In Living Organisms There are a variety of organisms that occurs on earth from giant organisms like the blue whale and redwood tree to microscopic bacteria of few micrometres. These organisms are classified into groups… Read More »NCERT solutions for class 9 Science chapter 7 Diversity In Living Organisms
Tissue 6.1-Tissue A cluster of cells in the body that performs a particular type of functions are called tissues. Eg- Blood, phloem and muscle etc Plants -•They contain supportive tissues generally made up of dead cells. Animal -•Tissues are generally made up of living cells.… Read More »Tissue
The Fundamental Unit of Life 5.1-Cell- •Cells are basic building units of all the organisms that are in our surroundings. .•Discovered by Robert Hooke in the year 1665. •He used primitive microscope for the observation. •Cell is a Latin word that has the meaning ‘… Read More »The Fundamental Unit of Life
Structure Of The Atom 4.1 Thomson’s model of an atom- •JJ Thomson was the first one to propose a model of a structure of an atom. •He compared atom with Christmas pudding and watermelon. Therefore this model is also known as plum pudding model •He… Read More »Structure Of The Atom
Atoms and Molecules 3.1 Laws of chemical combinations- Given by -Antoine L. Lavoisier and Joseph L. Proust 1- Law of conservation of mass –“Mass can neither be created nor destroyed in a chemical reaction.” 2- Law of constant proportion- “In a chemical substance the elements… Read More »Atoms and Molecules
Is matter around us pure 2.1 Mixture It is constituted by more than one kind of pure substance. Types of mixtures-There are two types of mixture: • Homogeneous mixture- A mixture which has a uniform composition throughout. Example- Salt /sugar dissolved in water. • Heterogeneous… Read More »Is matter around us pure
Matter in Our Surroundings Chapter – 1 (Chemistry) Everything in this universe is made up of material which we named as “matter”. Example – Stars, plants, clouds, stones are all matter. So, we can define matter as materials which occupy space and have mass. 1.1… Read More »Matter in Our Surroundings