CBSE Pathshala

Book resource: Science power Class 8 th Check point-01 [Formative Assessment]        1. Define Afforestation? Answer:  The practice of planting more and more trees is called Afforestation. 2. What is desertification? What causes desertification? Answer: The phenomenon of converting fertile land into desert is called desertification. Deforestation causes desertification. 3. What is the effect of deforestation on rainfall and climate? Answer:  Deforestation increases temperature and wind velocity that reduce rainfall. These changes led to climate change. Check point-02 [Formative Assessment]        1. What is wild life? Answer: Wild life is an area where organism lives in their natural habitat like dense forest, jungle and water bodies. 2. Give one difference between endangered and vulnerable ? Answer: Endangered are those animals that are not likely survive and will soon extinct where as Vulnerable are those animal which are likely to move in enda

Q. A student added a few pieces of zinc into dil.H ₂ SO ₄ taken in a test tube. Suddenly, evolution of gas occurs. What gas is evolved?              Answer: Hydrogen gas Q. Why do copper sulphate crystals change colour from blue to white on heating? Answer: Due to lose of water of crystallization which can also be called as dehydration Q.  What happens when a small piece of iron is kept in copper sulphate solution?      Answer: Simple displacement reaction results in the Formation of a brown coating of copper on the surface of iron nail. The green colour of the solution is due to the displaced Fe² ⁺ ions from the Iron nail Q.  While performing an experiment, a student adds sodium sulphate solution to a colourless solution. A white precipitate is immediately formed and is insoluble in dil. HCl. The colourless solution is …………………………… and the precipitate formed is…………………… Answer: Barium chloride reacts with sodium sulphate to form a white precipitate of barium sulphate[

Class 8th Science Term-01 1. Crops Production and Management 2. Microorganisms-Friend and Foe 3. Force and Pressure 4. Frictions 5. Chemical Effects of Electric Current 6.  Sound, Wave, Music and Noise 7. Synthetic Fibre and Plastics 8. Metals and Non-Metals 9. Conservation   of Plants and Animals Conservation Class VIII Mathematics [Click on links given below] VIII Algebra VIII Commercial Maths VIII Geometry & Mensuration   CBSE Class VIII Science Physics Chemistry Biology 8th Sample paper 8th Social Science