Science - Primary 5 Mid-Term Revision Sheet Model Answer
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1 Science - Primary 5 Mid-Term Revision Sheet Model Answer Q1: Complete the following statements: 1. The force that slows down the objects motion is called friction force 2. The direction of the friction force is always opposite to the body movement force. 3. The value of friction force between two surfaces depends on the type of materials of both surfaces. 4. Increasing the roughness of the surface increases the friction force. 5. Increasing the inclination of a surface decreases friction force. 6. We can use lubricants or ball bearings to decrease the friction force between the internal moving parts of machines. 7. The friction force between a moving body and the air is called air resistance. 8. Rockets and planes have a streamline shape to decrease the friction force. 9. When the friction force is equal to movement force, the body will move in a constant velocity. 10. Heart is located within the chest cavity between the 2 Lungs. 11. Heart beats cause pumping of blood to all body parts. 12. Heart consists of four chambers filled with blood and connected with blood vessels. 13. The blood vessels that emerge from the heart are called arteries. 14. Pulmonary artery carries deoxygenated blood. 15. Pulmonary veins carry oxygenated blood 16. All arteries carry oxygenated blood except pulmonary artery. 17. All veins carry deoxygenated blood except pulmonary veins. 18. The blood cells that attack microbes are called white blood cells (WBC) 19. The blood cells that carry O 2 and CO 2 inside the body are called red blood cells (RBC) 20. There is a valve between each atrium and ventricle. Page 1
2 21. The blood circulation between the heart and the lungs is called minor (or pulmonary) circulation. 22. The blood circulation between the heart and all body parts except the lungs is called major (or systemic) circulation. 23. When the left atrium contracts, it pushes the blood to the left ventricle. 24. The deoxygenated blood coming from body cells enter the heart through the superior vena cava and inferior vena cava veins. 25. Pulmonary artery sends blood rich with carbon dioxide to the lungs for gas exchange. Q3: Choose the most correct aswer: 1. The friction force works in the.direction of the moving body. (same opposite inclined) 2. Technicians use..to decrease the effect of the friction. (water sand Ball bearings) 3. The Friction force..the temperature between the parts of the machines. (increases decreases has no effect) 4. Friction between a rubber ball and dry cement is. that between a glass marble and metal surface. ( larger than smaller than equal to) 5. A rubber ball stops first on a/an. surface. (wet cement dry cement oily cement) 6. All of the following are disadvantages of friction except.. a. Rising of temperature between moving parts of machine. b. Preventing our shoes from slipping on the ground c. Damaging the internal moving parts of machines. 7. The heart is a muscular pump in the size of your.. (finger foot fist). 8. The..contain deoxygenated blood. (left atrium left ventricle right atrium) Page 2
3 9. The.. carry the oxygenated blood to all body cells. (aorta pulmonary artery pulmonary vein) 10. The is found between every atrium and ventricle. (wall valve air) 11. Blood passes from atria to ventricles through. (arteries valves veins) 12. When the blood is exposed to the air, a bloody is formed. (clot vein - artery) 13. Blood cells which are responsible for attacking microbes are. (RBC's WBC's blood platelets) 14. The blood circulation between the heart and body cells is called the. Blood circulation. (minor major normal) 15. The major (systemic) blood circulation starts from: a. Left ventricle to supply oxygenated blood to all body parts. b. Right ventricle to supply the oxygenated blood to all body parts. c. Left ventricle to supply non-oxygenated blood to lungs. Q4: Write the scientific term: 1. A set of small balls of smooth surfaces used between machine parts to decrease friction. ( ball bearings ) 2. It consists of three parts: heart, blood vessels and blood. (circulatory system) 3. A muscular organ about the fist in size located in the chest cavity. ( heart ) 4. A network of thin blood vessels near the body cells. (blood capillaries) 5. The artery that carries deoxygenated blood (rich in CO 2 ) to the lungs (pulmonary artery) 6. The artery that carries oxygenated blood to all parts of body. ( aorta ) 7. The blood cells that carry O 2 and CO 2 gases in the blood. ( red blood cells ) 8. It keeps the body temperature constant. ( blood ) 9. The blood cells that clots to prevent bleeding and heal the wounds. ( platelets ) Page 3
4 10. A yellow watery fluid in which blood cells float. ( plasma ) 11. Blood circulation between the lungs and the heart. (minor or pulmonary circulation) 12. Blood circulation between the heart and all body parts except the lungs. (major or systemic circulation ) Q5: Give Reason: 1. The bike slows down when you stop pedaling. Because of the friction force between the tire and the floor. 2. Lubricants and ball bearings are used in mechanical machines. To decrease the friction force between internal parts and avoid its damaging. 3. Parachutist opens his parachute when he flies in the air. To increase the surface area that increases the air resistance and land safely. 4. Car tires have grooves and channels To hold and squeeze the water out and avoid accidents. 5. The two sides of the heart are separated by a wall. To prevent mixing the blood of both sides. 6. Heart contains valves To allow the blood to pass in one direction from atrium to ventricle not the opposite. 7. White blood cells (WBC's) are called the defense cells. Because they defend our body against the attack of microbes. Q6: Write (True) or (False): 1. Technicians use sand to decrease the friction force in machines. (False) 2. Heart contains valves to allow blood to flow in two directions. (False) 3. Arteries carry blood from the heart to the body cells. (True) 4. The two vena cava veins deliver blood to the heart. (True) 5. Red blood cells defend the body against microbes. (False) 6. There are valves within the heart cavity. (True) Page 4
5 Q7: What happens if? 1. There is no friction force between car tires and the street. The driver will lose control on the car speed and will make accidents. 2. There are no valves in the heart. The blood will not flow in one direction and it will return back from ventricle to atrium. Q8: Cross out the odd word which differs from others and write it in the brackets: 1. Lubricants Oil Rough surface Ball bearings. (Rough surface) 2. Arteries Veins Valves Blood capillaries. ( Valves ) 3. RBC's WBC's Vein Platelets. ( Vein ) Q9: Match between each organ and its function: (A) 1) Red blood cell 2) White blood cells 3) Platelets 4) Blood (B) a) protect the body against microbes. b) help in healing the wounds c) keeps the body temperature constant. d) carry O 2 and CO 2 in the blood. 1). 2).. 3).. 4) Q10: Correct the underlined words: 1. The systemic blood circulation is between the heart and the lungs. (pulmonary or minor) 2. Platelets defend the body against microbes. (white blood cells) 3. The aorta delivers blood to the lungs. (all body parts) 4. The friction force affects in the same direction of the object's movement. (opposite) Page 5
6 Q11: Label the figure then answer the questions: Figure (1) G H 1-Figure name: heart F 2-Model labels are: A. right atrium A C B. right ventricle C. left atrium D. left ventricle E B D E. inferior vena cava F. pulmonary veins G. aorta H. pulmonary artery 3-There is a valve between A and B. 4- Organ G carries blood rich in Oxygen to all body cells Page 6
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