Tag Archives: NCERT Class 8 Science Solutions

Question: Classify various materials we use in our lives. Answer: All the materials we use can be broadly classified into two groups: Natural Resources: Natural resources are those resources which are present in our nature, gifted by God. They can be freely used. Soil, air, sunlight, water, etc., are some natural …

Question: What do you understand by ‘puberty’? Answer: The stage of life when the body becomes capable of reproduction is known as puberty. Question: Why is looking after physical health more important at adolescent age? Answer: Walking, jogging, aerobics, outdoor games etc, are good for the growing adolescent body. Question: Discuss the …

Question: Name three natural methods of adding nutrients to soil. Answer: The three natural methods of adding nutrients to soil are: Field fallow, Crop rotation and Mixed cropping. Question:  What are weeds? Answer: The unwanted plants that grow along with the crops and share nutrients are called weeds. Weeds decrease the crop …

Question: Why is reproduction important? Answer: Reproduction is important for producing new individuals of the same kind. Question: How is sexual reproduction different from asexual reproduction? Answer: Sexual reproduction requires two parents, one male and one female, to reproduce. Whereas in Asexual reproduction only one parent is required to reproduce. …

Question: What are the ‘building blocks of life’? Why are they so called? Answer: All living things are made up of one or more cells. For this reason, cells are known as the building blocks of life. Question: What is cytoplasm? Answer: The cytoplasm is a jelly-like substance that makes up most …

Question: Differentiate between metal and non metals on the basis of their physical properties? Answer: The difference is as follows: Question: What is the difference between physical state of metals and non-metals at room temperature? Answer: The physical state of metal and non-metal at room temperature: Metal are solid at room …

Question: Define force. Answer: Any push or pull is called force. Question: When does a body move? Answer: A body moves when force is applied. Question: What is the first requirement to put force into play? Answer: Interaction between two objects. Question: Give any example of push. Answer: Pushing a table …

Question: Give two examples each of natural and synthetic fibres. Answer: Natural fibres: Cotton, Silk Synthetic fibres: Rayon, Nylon Question: What is a polymer? Answer: Synthetic fibres are made up of molecules called polymers. Polymers are huge molecules-usually consisting of long chains made from thousand of similar small molecules called monomers. …

Question: What is a microorganism? Answer: Organisms that are so small that they can only be seen through a microscope, are called microorganisms or microbes. Question: Name the five groups into which microorganisms are divided. Which of these have only unicellular organisms? Answer:  There are five major groups of microorganisms. …