Sone hardeo international School

Very Short Answer Type Questions 1. Name the process by which energy is released from the digested food  Ans: The process by which energy is released from the digested food is respiration . 2. Name the two gases which are exchanged during relation  Ans: The two gases which are exchanged during relation are oxygen and carbon di oxide . 3. State whether the following statements are true or false (a) Respiration is a type of combustion at ordinary temperature. True (b) Oxygen is released during the process of respiration False (c) Energy can be released in the cells without oxygen True (d) During heavy exercise, the breathing rate of a person slow down  False (e) The size of chest cavity increases during inhalation True . (f) Frogs breathe through lungs as well as skin True (g) Fish has lungs for breathing False (h) Whales and dolphins live in water and heathe through gills False . (i) Insects breathe through spiracles and tracheae True 4. Nane an animal in which e...

Very Short Answer Type Questions 1. Name the process by which plants make food  Ans: Photosynthesis is  the process by which plants make food . 2 Name the part of a plant which produces its food.  Ans: Green leaf is  the part of a plant which produces its food. 3. What substance in the leaves gives them a green colour ? Ans: The chemical  substance chlorophyll present in the leaves gives them a green colour   4. What is the main vein of a leaf known as ?  Ans: The  main vein of a leaf known as mid rib . 5. Name the green pigment present in the leaves of a plant. Ans: Chlorophyll is  the green pigment present in the leaves of a plant. 6. (a) Name a gas used in photosynthesis.  Carbondioxide (b) Name a gas produced in photosynthesis. Oxygen . 7. Name the process by which plant leaves lose water into the air. Ans Transpiration is  the process by which plant leaves lose water into the air. 8. Which substance is used to remove chlorophyl...

Answer the following questions: 1. What is the percentage of oxygen in the atmosphere? Ans: The  percentage of oxygen in the atmosphere is 21%  . 2. Name the instrument which is used to measure atmosphere pressure. Ans: The  instrument which is used to measure atmosphere pressure is Barometer . 3. Name two methods of purify water. Ans : Boiling and filtration are two  methods of purify water . 4. What is loading Ans: Loading is process in which heavy particles settle down at the bottom . 5. Write an activity to show that air occupies space. Ans:  • Take an empty glass and a bucket half filled with water. • Put the inverted glass into the bucket of water. This must be done very quickly and forcefully. The glass must be kept straight and put inside in an inverted position. • The water does not enter the inverted glass. Why? The air present in the empty glass prevents the water from entering it. • When we tilt the glass held in water, we find that of air present in...

  1. What is the primary source of energy which causes changes in the weather ? Ans: Sun is the primary source of energy which causes changes in weather . 2. Name any two activities of our daily life which are planned according to the weather on a day.  Ans: We wear light coloured clothes during summer days and we prefer to wear dark colour clothes in winter . 3. What term is used to denote the amount of water vapour (or moisture) in air ? Ans: The term humidity is used to denote the amount of water vapour (or moisture) in air . 4. Name the instrument used to measure the rainfall at a place.  Ans: The instrument used to measure the rainfall at a place is rain gauge . 5. Name the unit in which rainfall is measured.  Ans: Millimeters (mm) is the unit in which rainfall is measured . 6. Which of two changes frequently weather or climate ? Ans: Weather changes frequently . 7. Name one state (or region) each in India having the following (a) Very hot and wet...

  Answer the following questions:  1. Name the various nutrients of the food. Ans: The various nutrients of food are carbohydrates, fats, proteins, vitamins and minerals . 2. Why are vitamins called protective foods? Ans: Vitamins are called as protective foods because vitamins protect our body from from diseases and keep our body healthy . 3. Name the different types of vitamins. Ans: Different kinds of vitamins are  Vitamin A,  Citamin B (B-complex), Vitamin C , Vitamin D , Vitamin E, Vitamin K . 4. What are functions of different minerals? Ans: Different minerals have different functions such as Iron builds red blood cell (RBC) Iodine is essential for the proper functioning of the thyroid gland which controls the growth of the body . Calcium makes the teeth and bones strong  5. What is roughage? Why is it important? Ans: Roughage keeps the food and waste matter (faeces) moving along the intestines and helps to prevent constipation . 6. Why is water necessary ...

 Answer the following questions : 1. What is sanitation? Ans : Sanitation refers to public health condition related to clean drinking water and adequate treatment and disposal of human excreta and sewage  2. Why should drinking water be purified? Ans: Water may contains germs which make us sick . This water may cause of many diseases like typhoid, cholera, jaundice etc . Therefore it is necessary to purify the drinking water . 3. What is canning? Ans: Canning is a method of food preservation by which food can be preserved in air tight containers where moisture and air can not enter into it .They also keep away insects, rodents etc from preserved food.  4. What are drying and dehydrating methods? Ans: Drying and dehydration are food preservative systems . Where the food can be preserved for many days as the water  content is removed from the food completely . Peas , pulses etc are preserved by this method . 5. What do you mean by sweetening? Ans: Sweetening is also a ...

 A. Which one is correct ? 1. Yellow substance on teeth is called- a. dentine   b. tar tar   c. plaque Ans: b 2. We must floss your teeth  a. every month b. everyday c. every week Ans: b 3. Sweets and chocolates ____ our teeth . a. spoil b. perfect c. clean Ans: a 4. Tooth decay causes a. toothache b. holes in teeth c. both Ans: c 5. Molars are also called a. tearing teeth b. cutting teeth c. grinding teeth Ans: c 6. The centre of each tooth is called  a. dentine b. pulp c. crown Ans: b B. Fill in the blanks : 1. We must brush your teeth at least twice a day . 2. Milk has calcium   that makes our teeth strong. 3. We must wash or floss your teeth everyday.  4. Microbes are very small living things. 5. Microbes that cause diseases are called germs . C. Write T' for true or 'F' for false statements :  1. We all are born without teeth. True 2. Every adult has a set of 36 teeth.  False 3. There are three kinds of permanent teeth....