MERL GROVE HIGH SCHOOL GRADE 8 SCIENCE 2017 INTEGRATED SCIENCE END OF YEAR EXAMINATIONS DURATION: 1 HOUR 30 MINUTES ANSWER ALL QUESTIONS

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1 INTEGRATED SCIENCE END OF YEAR EXAMINATIONS DURATION: 1 HOUR 30 MINUTES ANSWER ALL QUESTIONS DO NOT PUT ANY MARKINGS OR DRAWINGS ON THE PAPER THAT ARE UNRELATED TO THE EXAMINATION. SECTION A SECTION B NAME: DATE: FORM: TEACHER: KNOWLWEDGE AND (15) KNOWLWEDGE AND (34) (2) EXPERIMENTAL SKILL (3) EXPERIMENTAL SKILL (26) (12) POSSIBLE RECEIVED & 1

2 QUESTION ANSWER KEY PROFILE 1 D KC 2 A KC 3 D UK 4 C KC 5 D KC 6 C KC 7 B KC 8 A KC 9 D KC 10 D KC 11 B KC 12 D KC 13 D KC 14 A UK 15 D KC 16 C KC 17 D XS 18 B KC 19 B XS 20 A XS & 2

3 1. The diagram below shows a cell. This cell would be found in which organism a. Animals b. Fungi c. Viruses d. Plants 2. Tissue is composed of a group of; a. Similar cells working together b. Different organs working together c. Organ systems working together d. Nuclei in a cell working together 3. The diagram below shows a food web. Use the diagram to answer questions 3-5. b. Fox, bird and carrot c. Carrot, grass and grain d. Mouse, grain and carrot 5. Which organisms are producer, primary consumer and secondary consumer respectively? a. Grass, owl and fox b. Carrot, fox and bird c. Grain, fox and bird d. Grain, bird and fox 6. In general, which type of matter has the molecules packed closer together? a. gas b. liquid c. solid d. plasma 7. What is diffusion? a. The movement of molecules through a semipermeable membrane b. The movement of particles from an area of higher concentration to an area of lower concentration until evenly distributed. c. The movement of molecules from an area of low concentration to an area of high concentration. d. All of the above Which three organisms are competing for the same resources? a. Carrot, rabbit and Fox b. Grain, bird and owl c. Fox, owl and rabbit d. Bird, mouse and grasshopper 4. Which organisms are the producers? a. Carrot, grass and grasshopper & 3 8. Smoke and dust particles seen blowing in the wind are examples of; a. Diffusion b. Osmosis c. Brownian Motion d. All of the above 9. Choose the most suitable response. The particulate theory of matter states that; a. Matter is a tiny substance that makes up different particles. b. Matter is made up of different substances that are used to make the states of matter. c. Matter is made up tiny substances which are arranged differently to form different substances. d. None of the above

4 10. Which process is responsible for producing food in plants? a. Digestion b. Osmosis c. Chlorophyll d. Photosynthesis 11. Which is NOT an example of stored energy? a. Chemical energy b. Kinetic energy c. Nuclear energy d. Potential energy 12. Which of these is a renewable fuel? a. Charcoal b. Gasoline c. Natural gas d. Coal 13. Which of these things does not contain chemical energy? a. Food b. Gasoline c. A dry cell d. Electricity 14. We can conserve energy by a. Using more efficient appliances b. Using appliances for a longer time c. Using appliances that convert energy more quickly d. Using an oven instead of microwave for cooking 15. Which of these appliances does NOT change electrical energy to heat and sound? a. Radio b. Electric drill c. TV d. Flashlight 16. Which is the harmful part of solar energy? a. Light energy b. Infra-red rays c. Ultra-violet rays d. All of the above 17. A tomato is about 92% water. How much water would you get from eating two tomatoes? a. Exactly 92 g water b. About 90 g water c. About 180 g water d. There is insufficient information 18. Why can a spider walk on water? Because of? a. Cohesion b. Surface tension c. Adhesion d. Its large feet 19. Yam is 23% carbohydrate and 2% protein. The rest is water. What is the % of water in yam? a. 25% b. 75% c. 25 g d. There is insufficient information 20. If a mixture of sand in distilled water is filtered, what will the residue be? a. Sand b. Water c. Sand and water d. There will be no residue & Total 20 marks & 4

5 SECTION B ANSWER ALL QUESTIONS 1. Many organisms are multi-cellular - they are made up of lots of cells. Many of these cells are specialized to carry specific functions. a) What are cells (1 mark) KC Cells are the building blocks of all living organisms/ smallest unit of all living organism b) What are specialized cells? (1 mark) KC Cells that are differentiated to carry out a specific function/role c) Draw three specialized cells and state their functions (6 marks) KC Muscle cell Nerve cell Red blood cell To bring about movement carries impulses carries oxygen. 2. The diagram below shows an ecosystem where living and non-living organisms interact with each other & 5

6 a) What is the main source of energy for the ecosystem? The sun b) Identify one organism that contains chlorophyll Trees c) Identify one secondary consumer from the ecosystem. Frog d) Create a food chain in the space below based on the ecosystem shown. Water plant small fish big fish human (4 marks) UK 3. Match each word with the appropriate definition or description Alveoli trachea lungs diaphragm bronchioles thorax The smallest air passage in the lungs bronchioles The upper part of the body containing the lungs thorax The body organs where gas exchange takes place lungs Large sheet of muscle separating the thorax from the abdomen diaphragm Millions of tiny air sacs making up the gas exchange tissue alveoli The main air passage leading in from the mouth and nose trachea 4. Label the system below (6 marks) UK Mouth Salivary glands Oesophagus/gullet Liver Salivary glands Gall bladder Pancreas Large intestines Small intestines Anus Rectum (11 marks) KC & 6

7 Answer all the following questions 5. Name two minerals that are needed in a healthy diet Iron / calcium / phosphorus (1 mark) KC 6. Mrs Lindo enjoys food that is rich in fat and carbohydrate. She spends most of her time at home and does not walk far. i. State what diet related health problem she may most likely suffer from. Diabetes / Obesity (1 mark) UK ii. Define the term balanced diet A diet that contains all the nutrients from all food groups in their correct proportions (2 marks) KC iii. Mrs Lindo seems to be lacking useful vitamins. State what deficiency disease she may develop due to lack of vitamin A Poor night vision / night blindness / unhealthy skin / sore eyes (1 mark) KC iv. Name one food item that she could consume to obtain vitamin A. Carrot / eggs / green vegetables / liver / palm oil/ palm seeds (1 mark) KC 7. In the space below, WITH THE AID OF A DIAGRAM, explain what happens to the diaphragm, rib cage and lungs during inhalation and exhalation (10 marks) UK & 7

8 8. Tamara wants to find out if plants contain water, share the steps that she can follow in an experiment to determine if water is present in plants. Choose/identify a plant Put a piece of blue cobalt chloride paper on each surface of the leaf Cover the paper with microscope slides and fasten the slides together with sticky tape Observe any change for 5-15 minutes (5 marks) XS 9. Mrs. Coley placed a few potassium permanganate particles in a beaker with water for her science class to observe. i. Which process was she demonstrating? Diffusion (1 mark) UK ii. Describe what is meant by the above process Diffusion is the movement of particles from a region of high concentration to a region of low concentration until it s evenly distributed along a concentration gradient. (2 marks) UK iii. Describe the change that would be observed after several minutes The particles would gradually separate from each other and diffuse into the spaces between the water particles forming a uniform purple solution (3 marks) XS 10. (a) Carbohydrates Proteins Fats/ oils Vitamins Bread Rice Flour Minerals Water (9 marks) KC & 8

9 (b) MERL GROVE HIGH SCHOOL GRADE 8 SCIENCE 2017 NO High cholesterol / high blood pressure / obesity / diabetes (2 marks) UK i. How could Sam test if his food contains protein? Place a small amount of food sample such as egg or milk in a test tube Add 1 cm3 of sodium hydroxide solution and shake gently to mix Add copper sulphate drop by drop, until a visible colour change is observed. Shake tube after each drop A purple/violet colour change indicates that protein is present (4 marks) XS ii. What chemical can he use to test for starch? Iodine (1 mark) KC END OF EXAMINATION!! MARKS = 92 & 9