Book Second Term Test Model Answers. Page 84 to 87

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1 1. Write the scientific term: a. Red blood cells b. Aorta c. Ball bearings d. Air resistance e. silt soil f. sand soil 2. Write a brief account: Book Second Term Test Model Answers Page 84 to 87 a. friction: the force between two surfaces in contact and acts in opposite direction of motion and causes the object to slow down. b. plasma: it is a watery yellow fluid that carries the wastes and digested food c. sand soil: it is composed mainly of sand particles and rarely amount of clay and silt particles with rarely amount of humus. d. aorta: it is the largest artery that carries oxygenated blood from the heart to all body parts except the 2 lungs e. sweat : it is excreted through sweat glands in the skin. It consists of excess salts and excess water f. water resistance: is a type of friction force as an object moves through water 3. Choose the correct answer: a. 2 lungs b. 2 kidneys c. 3 fist d. 1 arteries e. 2 white blood cells f. 3 medium g. 3 Ethiopian h. 1 tiny i. 2 sand j. clay 4.Put Tue or False: a. eating diets low in fats and salts

2 b. humans blood c. harms urinary bladder d. urethra e. f. g. h. clay i. to all the body parts except the 2 lungs j. soil k. sand soil 5. Complete the following sentences: a. water resistance b. air resistance c. motion d. friction force e. friction force f. chemical fertilizers, chemical pesticides, industrial wastes. h. clay soil, sand soil, silt soil j. medium, high, highest k. Ethiopian Question (1): Book Second Term Test Model Answers Page 88 to 96 Complete: 1. Deoxygenated, oxygenated 2. Pulmonary artery 3. Ureter, urine. 4. Sweat glands in the skin, lungs. 5. Ethiopian 6. Silt 7. Clay, sand 8. Silt soil 9. Chemical fertilizers, chemical pesticides, industrial wastes. 10. decrease the friction force

3 11.blood, blood vessels and heart 12. humus, air, water, gravels. 13. clay soil Question 2: What s meant by.? 1. Pulmonary blood circulation: It is minor blood circulation. It is from the heart to the lungs 2. Sweat glands: they excrete the excess salts and excess water in form of sweat 3. Humus: the decayed remains of plants and animals in soil is called humus, that adds nutrients to soil. 4. Soil pollution: it is a kind of pollution that harms the cultivated plants, causing dryness of the soil, death of small living organisms that live in the soil, leaking of harmful substances to the plant and animals. 5. Friction: the force between two surfaces in contact which acts in opposite direction of motion. 6. Ball bearings: small metallic balls having smooth surface to decrease the effect of friction force. 7. major blood circulation: it is the circulation from the heart to all body parts except the 2 lungs. 8. the ureter: it is a narrow tube that connects the kidney to the urinary bladder. 9. the urinary bladder: it is a balloon sac that stores urine temporarily until it is released outside the body through urethra. 10. the pulmonary artery: it is the only artery that carries deoxygenated blood. 11. the fertility of soil: it is related to the amount of humus in the soil. 12. soil : it is thin non-compacted superficial layer of earth s crust. 13. silt soil: it is composed of a mixture of gravel, sand, clay, silt and more humus. 14. white blood cells : they are cells with nuclei that defend the body against microbes. 15. blood plasma: it is watery yellow fluid that carries digested food and wastes. 16. blood vessels: blood flows inside your body through a network of blood vessels, there are three types of blood vessels, blood capillaries, arteries and veins. Question 3 What s the function of the following? 1. Red blood cells: carry gases

4 2. Blood platelets: help in healing wound by forming blood clot. 3. Plasma: carry digested food and wastes. 4. Kidney: filters the blood from nitrogenous wastes and excess salts in form of urine. Question 4: The factors are wind, water, raining, running water and heat. Question 5 Question 6 See page 76 Advantages of friction force: 1. Friction enables us to control car movement. 2. Car brakes that are used to slow down or stop car depends on friction. 3. Friction between your shoes and ground helps us to walk and prevent slipping 4. Lighting up a match needs friction to generate heat. Question 7 To decrease friction force: Question 8 Question 9 1. Using lubricants and oils 2. Using ball bearings 3. Decrease surface area (streamline shape) Question 10: Importance of soil: see p59 How to maintain the circulatory system healthy : see page 36 Urinary system: see page 44 Give reasons for: 1. To allow the flow of blood from atria to ventricles and prevent its returning back. 2. To keep our circulatory system healthy 3. To allow blood to deliver food and oxygen to the cells and then carries carbon dioxide and wastes products.

5 4. Because they are solid wastes that are stored in large intestine before passing out of body. (excretory wastes are wastes from the body cells) 5. Friction force helps to control the car movement to slow down. 6. To avoid the soil pollution. 7. To increase the friction force to land safely. 8. To decrease the friction force to increase the speed 9. To decrease the disadvantages of friction between the machine parts. 10. To decrease the friction between moving parts of the machines. 11. Question 12. due to the large particle size of sand soil and the spaces between particles that allow air to pass through them. Question 11 Choose: 1. Peanut plant 2. Left atrium 3. Friction 4. Increasing fertility 5. Opposite 6. Blood platelets 7. Plasma 8. Increase the acidity of the soil Question 12: 3) Look at the opposite diagram then answer: 1. The name of diagram is urinary system 2. Labels are : 1. Kidney 2. Urinary bladder 3. Ureter 4. Vein 5. Artery 3. Function of number 2 is: stores the urine 4. Urine is formed as kidneys filter the blood from nitrogenous wastes and excess salts dissolved in water in form of urine

6 1. Labels: 1-Left ventricle 2-Right ventricle 3-Right atrium 4-Left atrium 5-Muscular wall 6-Pulmonary artery 7-Aorta 8-Pulmonary artery 9-Pulmonary veins 10-Superior vena cava 11-Inferior vena cava 12-Valves 2) Function of number 12: Valves: Allow the blood to flow from the atria to the ventricles and prevent its returning back (One direction valve). 3) Kinds of blood vessels: Arteries Veins Blood capillaries Question 13: A. Defects resulted from the following: 1. Chemical pesticides: Contamination of plants. Harms the humans and animals that feed on the contaminated plants. 2. Chemical fertilizers: Kill the living organisms that live in the soil. Harms the humans and animals that feed on the contaminated plants.

7 3. Industrial wastes: Increases soil acidity. Decrease the soil salts and deprives the plants from them. 4. Increases soil salinity: Loss of cultivated plants. Increases soil salts. Soil dryness. Leads to Fallow land. Increases salinity. B) What happens in case of? 1-It will kill the living organisms that live in the soil and harms the humans and animals that feed on the contaminated plants. 2-It will cause dryness of the soil and increasing its salts and loss of the cultivated plants. 3-Nothing will hold the soil in its place causing soil erosion, the plant will not be held in the soil, the nutrients and water will not be absorbed from the soil, and the nutrients and the humus will not be added to the soil. 4-The tunnels that allow the passage of the air, water and nutrients to the soil will not be found and the plants will not pass easily throughout the soil. 5-The body will be poisoned with nitrogenous and harmful wastes and it will die. 6-It will harm the urinary system and poisoned the body. 7-It will harms and weakens the circulatory and urinary system. 8-The oxygenated blood and the deoxygenated blood will be mixed. 9-The heart beats will increase due to the need of the cells to more blood carry oxygen and digested food. 10- can t control the car movement causing accidents. 11- slipping and we can t stand. 12- increase the friction force 13- friction decreases and we can t control the car movement causing accidents. 14- This decreases the friction force to increase the speed of movement. 15- machine parts will be damaged due to friction force.

8 Question 14: (1) Column A 1. The right atrium E 2. The right ventricle B 3. The left atrium H 4. The left ventricle A 5. Pulmonary vein G 6. Pulmonary artery D 7. Valve C Column B (2) Column A 1.Red blood cells 2.White blood cells 3.Blood platelets 4.Plasma (3) D E B A Column B Column A 1.Chemical fertilizers 2.Soil salinity 3.Natural fertilizers 4.Industrial wastes D C A B Column B (4) Column A 1. To increase the friction force B 2. Friction force D 3. Grooves on the car s tires A 4. to decrease the friction force C Column B (5) 1.Silt soil Column A B Column B

9 2.Clay soil 3.Sand soil C A Question 15: Complete the table: Points of comparison Clay soil Silt soil Sand soil Formation(components) Mainly clay Small silt Small sand Small humus (or medium). Mixture of gravels, clay, silt, sand, much humus. Mainly sand Small silt Small clay Rarely humus. Color Dark Grey Yellow Size of particles Smallest Medium Largest Compactness Highest/very compacted Medium Least/loose/non compacted Drainage of water Poor/least/low Medium Fast/highest Fertility Medium fertility Highest fertility/more Least/poorly fertile Question 1 What s meant by? Book Model Exam Second Term Page 97 to 100 Model Exam 1 1. friction force: the force between two surfaces in contact that acts in opposite direction of motion 2. Excretory materials: these wastes which body cells produce, some of these materials are harmless, but your body cannot use them, while others are dangerous to the body, such as nitrogenous wastes, carbon dioxide and water vapour. 3. Minor blood circulation: it is the circulation between the heart and lungs. It is called pulmonary circulation. Question 2:

10 Put or then correct the wrong one: Question 3: Question 4: Complete the following: 1. Opposite carbon dioxide, oxygen What happens when: 1. The body will not be able to get rid of harmful nitrogenous wastes. 2. Plants will not be able to grow in this soil as it doesn t contain more humus. Question 1 Write the scientific term 1. ball bearings 2.the soil 3.humus Model Exam 2 Question 2: Question 3: put or and correct white blood cells Complete: 1. The kidney.

11 Question 4: Question 5: 2. The artery. 3. Clay soil. See page 44 See page 63

1. is used to decrease the effect of friction force between the internal moving parts of machines.

1) Complete the following sentences : 1. is used to decrease the effect of friction force between the internal moving parts of machines. 2. Friction force has its effect in the direction of the objects