Natural Sciences Grade 9 IEB June 2019 Question Paper

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Downloaded from hlayiso.com GRADE 9 NATURAL SCIENCES EXAMINATION JUNE 2019 LIFE SCIENCES PAPER TIME: 1 HOUR MARKS____/60 NAME: QUESTION 1 ANSWER QUESTION 1 ON THE QUESTION PAPER 1.1. Various possible answers are provided for each question. Choose the best answer and write only the LETTER in the box provided. 1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 1.1.7 1.1.8 1.1.9 QUESTIONS 1.1.1 and 1.1.2 refer to the flow chart below. O2 and glucose X Y CO2 and water 1.1.1 Which process is represented by X and Y respectively? (1) X Y A Respiration Photosynthesis B Photosynthesis Respiration C Transpiration Photosynthesis D Photosynthesis Transpiration 1.1.2 Radiant energy is… A not involved in these processes. B needed by both X and Y. C needed by Y and released by X. D needed by X only. (1) Courtney wanted to find out if an aquatic plant can undergo photosynthesis faster under fluorescent light or sunlight. She prepared the following set-up for her experiment. Page 1 of 11

Downloaded from hlayiso.com 1.1.3. Which one of the following sets of apparatus A, B, C or D, should Courtney prepare in order to conduct a fair test? (1) A B C D 1.1.4. The main reason why meat feels softer than wood is that the cells in meat have A. smaller vacuoles B. more cytoplasm C. no cell wall D. no mitochondria (1) 1.1.5. The diagram below shows the process of cell division when the original cell has divided twice. How many cells will be produced if the original cell undergoes 5 cell divisions? A. 8 B. 16 C. 32 D. 64 (1) Page 2 of 11

Downloaded from hlayiso.com Questions 1.1.6.to 1.1.8. are based on the micrograph below: Micrograph showing onion epidermal cells 1 2 4 3 1.1.6. Which numbered part in the micrograph above represents the part of the cell which contains information about all the processes that take place in that cell? A. 1 B. 2 C. 3 D. 4 (1) 1.1.7. The part labelled 1 is made of cellulose. Part 1 is A. permeable B. partially permeable C. impermeable D. non-permeable (1) 1.1.8. The cell structure which controls the entry and exit of substances in the cell is: A. 1 B. 2 C. 3 D. 4 (1) 1.1.9. The cells have been cut in A. Longitudinal section B. Cross section C. Transverse section D. Vertical section (1) [9] Page 3 of 11

Downloaded from hlayiso.com 1.2. Choose a term from COLUMN Y that matches a statement in COLUMN X. Write only the letter (A – J) in the space provided in front of column X. COLUMN X COLUMN Y _____ The jelly-like substance between the nuclear A multicellular membrane and cell membrane _____ Similar cells which work together to perform a B organ specific, common function _____ The human body consists of trillions of cells C nucleoplasm _____ A group of different systems that function D specialised together E cytoplasm F unicellular G organism [4] 1.3. Explain the general trend of the following graph. (The graph does not have a heading) [3] Page 4 of 11

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Downloaded from hlayiso.com 1.4. Owethu observed the following micrograph of a cell organelle. Micrograph of a cell organelle Magnification: X 25 000 B A 1.4.1. Identify the cell organelle shown in the above micrograph. (1) 1.4.2. What type of microscope was used to photograph this image? (2) 1.4.3. Calculate the true length of the organelle in micrometres. Measure the organelle along the line AB. Show all working. (3) [6] Page 6 of 11

Downloaded from hlayiso.com ANSWER THE FOLLOWING QUESTIONS ON THE LINED PAPER PROVIDED. QUESTION 2 A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats. Hannah tested ‘Wellwarm’ to see how well it insulated a beaker of water at 60OC. She tested ‘Wellwarm’ and three other materials as shown below. She wrapped each beaker in a different material. She recorded the temperature at the start, and 20 minutes later. 2.1 Name the independent variable. (1) 2.2 Name the dependent variable. (2) The results of the investigation are shown below. Hannah said that the ‘Wellwarm’ material is the best insulator. 2.3. Based on the results, which material, A, B, C or D, was ‘Wellwarm’? (1) 2.4. Use the evidence in the results table to explain your choice in question 2.3. (2) Page 7 of 11

Downloaded from hlayiso.com The company made a coat from each of the four materials they tested. Mosa tested the different coats by wearing each one in a cold room. She measured the temperature inside each coat for 30 minutes. 2.5. State TWO variables (other than those mentioned above) that should be kept the same to make this a fair test. (2) [8] QUESTION 3 3.1. Distinguish between a CONTROL and a CONTROLLED variable. [2] 3.2. The purpose of yeast in the making of bread is to produce the gas that makes bread rise. Yeast does this by using the sugars in flour, and releasing carbon dioxide. Reese designed an experiment to test the effect of temperature on the rising of bread. METHOD: I mixed flour, water, yeast and sugar to make a dough. I used a koki to mark three measuring cylinders A, B and C. I added 20 ml of dough to each of three measuring cylinders. I kept the measuring cylinders at three different temperatures for one hour. 3.2.1. Suggest TWO ways that Reese could improve the format of the method. (2) Page 8 of 11

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Downloaded from hlayiso.com Observe the thermometers and measuring cylinders AFTER ONE HOUR. A. B. C. A B C 3.2.2. Draw a table of results showing the CHANGE in volume of the dough over the course of the experiment. (8) [10] QUESTION 4 4.1. During a Natural Sciences lesson, girls observed specimens under the compound light microscope: 4.1.1. when only should Kiera use the coarse focus knob? (1) 4.1.2. which parts should Katelyn use to work out the magnification? (2) 4.1.3. when would Kendall open the diaphragm wider? (1) 4.1.4. what should Kayleigh do if she cannot find the specimen when she Page 10 of 11

Downloaded from hlayiso.com changes to a higher power? (2) 4.1.5. what should Calleigh do if the specimen is blurry when she changes to a higher power? (1) 4.1.6. why should Celeste not move the tube downwards whilst looking down the eyepiece? (1) 4.1.7. what should Kayla do if the field of view is half-light and half-dark? (1) 4.1.8. if Chloe moves the glass slide towards the left, which way would the specimen move if she was looking at it through the ocular? (1) [10] 4.2. The following diagram shows the field of view of a microscope under LOW power. Mikayla placed a ruler measuring in millimetres on the stage to determine the size of the field of view. 4.2.1 What is the approximate width of the field of view in i. millimetres? ii. in micrometres? (2) 4.2.2. If 5 cells fit across the above field of view on low power, what is the approximate size of each cell in micrometres? Show all working. (3) 4.3. State TWO advantages and ONE disadvantage of using a compound light microscope to view specimens rather than an electron microscope. (3) [8] TOTAL: 60 Page 11 of 11 Powered by TCPDF (www.tcpdf.org)