ITL Public School Half Yearly ( )

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ITL Public School Half Yearly (017-18) Science(SET A)ANSWER KEY Date: 1.09.17 Class: VII Time: hrs M.M : 80 Q.1 Which gas present in air is essential for aerobic respiration? CO Q.

They require Nitrogen which is not supplemented from soil, Pitcher Plant. Q.4 Where is gall bladder present in human body? What is its role? Present below Liver. It secretes bile Juice Q.

1 ITL Public School Half Yearly (017-18) Science(SET A)ANSWER KEY Date: Class: VII Time: hrs M.M : 80 Q.1 Which gas present in air is essential for aerobic respiration? CO Q. Name the carbohydrate that is digested by ruminants but not by human beings. Cellulose Q. Why do insectivorous plants feed on insects? Give example of an insectivorous plant. They require Nitrogen which is not supplemented from soil, Pitcher Plant. Q.4 Where is gall bladder present in human body? What is its role? Present below Liver. It secretes bile Juice Q. Rita wrote a food chain in the following way: Frog eagle insects grass snake. The chain is not in correct order. Help her to write correctly. Grass, Insect, Frog, Snake, Eagle. Q.6 a)why does an athlete breathe faster and deeper than usual after finishing the race? The food has stored energy, which is released during respiration. Therefore, all living organisms respire to get energy from food by breathing the air. During heavy exercise, fast running, cycling, walking for many hours or heavy weight lifting, the demand for energy is high. Therefore, to meet the extra demand of energy, an athlete breathes faster and deeper than usual after finishing the race. b) Give any two differences between aerobic and anaerobic respiration. 1 1 Q.7 a)what is the average body temperature of a healthy person? 7 c b)what is the range of laboratory thermometer? - 10 c to 110 c c)what is the use of kink in a clinical thermometer? Kink prevents mercury level from falling on its own. Q.8 a) Distinguish between a parasite and a saprotroph. Parasite Saprotroph The organism that grows on the body of The organism that obtains nutrients from another organism and derives nutrients from the dead or decaying organic matter is it is known as a parasite. called saprotroph. VII A 1 of

2 Parasite develops special organs like suckers, hooks or haustoria to obtain nourishment from the host. Examples of parasites are Cuscuta, orchids etc. Saprotroph is capable of secreting some enzymes which can digest complex molecules of into simpler forms. Examples of saprotrophs are fungi, bacteria etc. b) Name the test to show the presence of starch in leaves? Answer: The presence of starch on leaves can be tested by Iodine Test. Iodine turns starch solution blue. Q.9 (a) Define chemical change and physical change. Change in which new substances are formed. It is irreversible change. No new substances formed and is reversible change. (b)classify the changes involved in the following processes as physical or chemical changes: i)photosynthesis Chemical change ii) Dissolving a spoon full of sugar in water. Physical change. iii)beating iron to make it into thin sheets. Physical change. iv)digestion of food in our body. Chemical change Q.10 A student took a solution of copper sulphate in a beaker and put a clean nail into it and left it for about an hour. a)what Colour changes do you expect? Blue to Pale Green b)are these changes chemical in nature? Yes c)write a word equation for the chemical change, if any. CuSO4+Fe FeS04+Cu Q.11 Rohan covers a distance of 10 km by running with uniform speed of 4.km/hr.Sohan runs 1. km in 1 minutes.who runs faster? Or A jeep starts its journey from Pune at 0:00am. It reaches its destination at 07:00 am. The distance covered by the car at various time intervals are as follows: Time (am) 0:00 0:0 06:00 06:0 07:00 Distance (Km) a)draw the distance time graph for the given data. Graph 0. b)mention the scale chosen by you for distance and time. VII A of

3 Scale 0. c)from the graph find out the distance covered by the car at 0:1 am. 10 Km 1 d)calculate the average speed of the car in Km/hr. 40 Km/Hr 1 Q.1 Sahil went to hill station where he found villagers making steps on the slopes of hills to make fields in order to grow their crops. a) What is the use of making steps? Conservation of Rain water b) How will this process conserve water? Prevent wastage of water from flowing down the hill. c) Write any two values that you learn from these villagers? Importance of water conservation, Scientific aptitude, Environment concern Q.1 Q.14 a) What do you understand by egestion? Answer- Removal of waste materials from the body, time to time from anus is called egestion. 1 b) i)how many types of teeth are found in human beings? Answer- There are four types of teeth in human beings. These are called incisors, canines, premolars and molar.1 ii)write one function of each type of teeth. Cutting, Biting Holding, Grinding 1 a) Why does shearing does not hurt sheep? It removes only dead skin 1 b) What is meant by selective breeding? To choose parents with particular characteristics to breed togeather and produce off springs with more desirable character. 1 c) Name two fibres obtained from animals. Silk, Wool 1 OR a) What is sorters disease? It is a disease caused by spores of bacterium Bacillus. It causes respiratory disease 1 b) What do you mean by sorting? The fleeces are spread on table and the wool is separated from each other on the basis of quality 1 c) Name two fibres obtained from plants. Jute, Cotton 1 Q.1 a) Explain the role of forests in maintaining balance between oxygen and carbon dioxide in the atmosphere? Cycle 1. b) How do forests prevent floods? Roots hold soil, trees help in transpiration and maintaining water cycle 1. c)what do you mean by canopy? Tall trees look like a roof over the other plants in the forest, this is called canopy. Q.16 Observe the figures given (A) and (B) and answer the following: VII A of

a) Diagram Inhalation, Exhalation 1 b) Draw the diagram A and B given in paper and indicate the direction of : i) movement of air Air is drawn in and air is forced out.

4 a) Diagram Inhalation, Exhalation 1 b) Draw the diagram A and B given in paper and indicate the direction of : i) movement of air Air is drawn in and air is forced out.1 ii) movement of diaphragm Diaphragm moves down, Diaphragm moves back1 iii) Movement of ribs in and out 1 c) Why hot water baths are advised after muscle cramps? Hot water removes cramps as it removes the accumulation of lactic acid. 1 Q.17 a) A simple pendulum takes 96seconds to complete 60 oscillations. What is the time period of this pendulum? Formula 0., Calculations- answer 1.6s 1. b) Give one word answer: i)the SI unit of speed. m/s 1 ii)an instrument which shows the distance travelled by a vehicle. Odometer 1 c)the speed of a moving car is 7km/h. Calculate its speed in m/s. 0 m/s 1 Q.18 a) Draw a well-labeled diagram of water cycle. Diagram b) Write any two factors effecting the depletion of water table. Any two- Q.19 a)how is food ingested by Amoeba? Pseudopodia 1 b) What is the role of HCl in stomach of a human being? Mechanical Digestion, gastric Juice, HCL helps in digestion of proteins 1 c) Where is saliva produced? Write any two functions of saliva. Mouth 0., Digestion of starch, It helps to chew the food and makes food soft. 1. d) How is the process of digestion different in ruminants? Ruminants have four-chambered stomach. It is a complex and regurgitation takes place ( any one) 1 Q,0 Explain briefly the life cycle of a silk moth with the help of a well-labeled diagram. Diagram OR Explain the various steps involved in silk production. Steps Q.1 a) List any four products, which we get from forests. Wood, Fruits, Rubber, Wax, Herbs, Fodder etc b) What is the use of decomposers to the soil? They breakdown dead or decaying organisms and convert them into humus 1 VII A 4 of

5 c) Few seedlings were seen sprouting on a heap of animal droppings in a forest. How do you think is the seedling benefited from the animal waste? They give nutrition,readymade food and add humus to soil Q. Observe the figure carefully and answer the following questions: a) Which process is being tested in the above activity? Testing of the presence of carbon dioxide gas 1 b) What is the result of this activity? Give reason. It turns lime water milky 1 Q. A cold steel spoon is dipped into a cup of hot coffee, it will transfer heat to its other end or not? If yes, then by which process? Yes 1,conduction as it is a metal 1 Q.4 Explain why rusting of iron object is faster in coastal area than desert? More moisture and heat more is the rate of rusting Q. Name the type of motion represented by graphs a and b given below? (a) Distance (b) Distance Time Time (a) Uniform speed (b)stationary 1,1 Q.6 a)what would you do when you see your classmates wasting water, while filling their water bottles? I will educate them about importance of water and paste a slogan near the tap 1 b) What method will you adopt to utilize the wastewater coming out of your R.O plant (which purifies tap water)? Any 1 Q.7 Rahul wanted to buy a pashmina shawl from a Kashmiri shop in Delhi. Suggest him a method by which he can test that the shawl he is buying is made up of pure pashmina or is a duplicate. By burning if smell of burning plastic then it is fake, if smell of burning hair then it is pure. VII A of

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INDIAN SCHOOL AL WADI AL KABIR Summative Assessment I, 2014 Class: VII SCIENCE M.M: 60 17/09/14 Time: 3 hrs

INDIAN SCHOOL AL WADI AL KABIR Summative Assessment I, 2014 Class: VII SCIENCE M.M: 60 17/09/14 Time: 3 hrs General Instructions: (i) The question paper comprises of three sections A, B and C. (ii) All