CBSE ADDA

Q. What is habitat?  Answer: The surroundings where plants and animals live, is called their habitat. The presence of specific features, which enable a plant or an animal to live in particular habitat, is called adaptation. Q. Which organism grow throw their lives  Ans: Plants Q. What do living organism produce when oxygen combine with food?  Ans: Energy and carbon dioxide Q. Name the process of giving out waste from body  Ans: Excretion Q. What is the time within which a living stay alive?  Ans: life span Q. what is by product of respiration?  Ans: Carbon dioxide Q. what is similarity of cell and an atom of matter?  Ans: Both are structural units. Q. Name a plant that shows response to stimulus?  Ans: Touch me not and sunflower Q. State any two similarities between living and non living?  Ans: Both are made up of matter and have structural unit .  Q. what are the factors on which growth of living things depends on?  Ans: Growth in living things depen

Changes around us are continuous process .  Some changes occur naturally and some changes can be brought about by us. Such changes are: Rusting of iron, change of the state of water, Burning of wood, Growth of nail and hair, Blooming of flower and change in day and night ,season change, What are different types of changes? 1. Reversible changes : Changes that can be reversed is called Reversible changes. Example: water changes into ice on cooling, wax change into liquid on heating, blowing of balloon  2. Irreversible changes: Changes that cannot be reversed is called irreversible changes. Like Milk change in to curd, Iron changes to rust, Burning of paper, cooking of food, Growth of plant and animals, weathering of rocks, wear and tear of tires. 3. Physical changes : Changes in which physical properties like shape, size and state changes without formation of new substance is called Physical changes. It is a type of reversible changes. e.g. Melting of wax, solution of su

Q. What is luster? Ans: Materials around us have a particular type of shine called Luster like gold, silver, aluminum etc Q. Some metal can hammered into thin sheet without breaking into pieces. Name this property of metals? Ans: Malleability. Q. Some metal drawn into thin wire. Name this property of metals?  Ans: Ductility. Q. Name material used to make chalk?  Ans: Calcium carbonate Q. Why do houses have cement floor?  Ans: Houses have cement floor because it can polished to make attractive. Q. Define soluble and insoluble substance? Ans: Material that mixed with water is called soluble e.g. acid, base, milk, lemon juice, sugar and alcohol. Material that do not mixed with water is called insoluble like oil, sand, alum etc  Q. what will happen if you drop piece of chalk and sponge in to glass of water? Ans: Chalk and sponge absorb water due to gap between their particles. Q. Which material you prefer to use for furniture? Ans: Wood and Metal  as

Q. What is supernatant liquid ? Ans: A clear liquid that collected by decantation is called supernatant liquid. Q. Define loading. Ans : The process of increasing the rate of sedimentation ion by adding potash alum (fitkiri)  to it is called loading. Sometimes very fine solid particles do not sink to the bottom during sedimentation. By adding potash alum impurities became heavier and settle down .eg. muddy water, cleaning of river water . Q. What is Filtration? Ans: Filtration is a separation technique that is used to separate a solid that has not dissolved in a liquid. In this process mixture of the solid and liquid is allow to pass  through the filter paper. The clear liquid separated in the container is called the filtrate. The solid that remains in the filter paper is called the residue. Q. Why filtration is preferred over decantation? Ans:  Sometimes in decantation the liquid is not completely separated from an insoluble liquid then we  apply  the method of decanta

Q. What is Nutrients? Ans: The chemical present in food is called nutrients . Q. What are major components of foods? Ans: The major components nutrients are: carbohydrates,Fats,Vitamins,Proteins,Minerals,Roughage and Water Q. What are major nutrients of foods? Ans: carbohydrates, Fats, Vitamins , Proteins and Minerals Q. Name the components of food other than nutrients that are needed by our body. Ans: Components of food other than nutrients that are needed by our body are dietary fibers and water Q. What are fats? What are its types? Ans: Fats are energy giving nutrients comes from plants and animals. Fats comes from animal are called animal fats like milk cheese, butter etc. Fats comes from plants are called vegetable fats like fruit , coconut, soya beans etc Q. How fats are use full to us? Ans: Fats give us energy. Fats also protect skin from injury, heat and cold. fats also absorb vitamins from fats soluble vitamins. Q. why we do not eat excess fats? Ans: If we eat excess fat

Class 07 Science Chapter Water Q. Why are we left only tiny fraction of water for use even if about 75 % of the earth surface is covered with water. Ans: This is because most of the water about 97% of surface water is in sea and ocean as salty water that is unfit for domestic and agricultural use. Q. What are the various uses of water? Ans: Water is used for various activities such as agriculture, industries, cooking, cleaning utensils, bathing, washing clothes, and, most importantly, for drinking. Q. What are the three state of water? Ans: There are three states of water a. Solid state: ice, snow and hail  b. liquid: Rain, river, sea    c. Gaseous: Water vapour Q what is water cycle? Ans: The circulation of water from atmosphere to the earth and vice versa is called the water cycle. Q.What is evaporation? Ans: The water present on the surface of the ocean evaporates by the sun’s heat. This process of conversion of water from liquid state to vapour state is called evaporati

CLASS VI –SCIENCE HIGHER ORDER THINKING SKILLS WATER 1. Rainy season comes always after summer season. Why? 2. Wet clothes dry faster if you keep them under a fan. Why? 3. If you won’t drink enough water, what happens to your body? 4. A village near a river will always get ground water where as a village which is far away will face acute water problem. Why? 5. You are drenched completely while playing in the rain. But you did not stop playing. To your surprise, your clothes dried after some time.How? AIR AROUND US 1. Sky appears blue. Why? 2. How the fish could live in water? 3. Your father while going to the office, keep a mask to his nose. Did you ever ask your father why he will keep it? 4. Why mountaineers carry Oxygen cylinders with them while climbing high mountains? 5. If you add mud to water, you observe bubbles in water. Why? GARBAGE IN, GARBAGE OUT 1. Each tree can make its own manure. How? 2. You have noticed your