SPINE ROAD HIGH SCHOOL

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1 SPINE ROAD HIGH SCHOOL VIA AD SUCCESSORUM LIFE SCIENCES GRADE 11 CONTROL TEST TIME: 1½ hours MARKS: 80 INSTRUCTIONS: Read the following instructions carefully before answering the questions. 1. Answer ALL the questions. 2. Skip a line between every sub question e.g and Start EACH question on a clean page. 4. Write ALL answers on the ANSWER SHEETS. 5. Start the answers to EACH question at the top of a NEW page. 6. Number the answers correctly according to the numbering system used in this question paper. 7. Write neatly and legibly. 8. ALL drawings should be done in pencil and labelled in blue/black ink. 1

2 SECTION A QUESTION Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) next to the question number (1.1.1 to 1.1.4) on your ANSWER SHEET, for example D The diagram below shows the movement of two gases during the day and during the night. A. W and Y B. W and Z C. X and Y D. X and Z Which letters represent carbon dioxide? The diagram below represents a chloroplast in which photosynthesis is taking place. V Chloroplast PHOTOSYNTHESIS Product Y move into the atmosphere W Product Z formed in the stroma The requirement and products indicated are: V W Y Z A water oxygen carbon dioxide Carbohydrates B water carbon dioxide oxygen carbohydrates C oxygen water carbohydrates sunlight D water carbon dioxide sunlight oxygen 2

3 QUESTION IS BASED ON THE DIAGRAM BELOW B 1 2 A If B is carbon dioxide and water and A is glucose, then 1 is A. fermentation B. cellular respiration C. anaerobic respiration D. photosynthesis Which of the following takes place in green plants but not in humans? A. glucose is stored as glycogen B. glycogen is converted into glucose C. glucose is stored as starch D. cellulose is stored as glucose (4X2) [8] 1.2 Give the correct Biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.3) on your ANSWER SHEET Molecules that act as energy carriers A structure with a glass or plastic roof and walls, where plants are cultivated The type respiration that occurs in the absence of oxygen. (3X1) [3] 3

4 1.3 Indicate whether each of the statements in COLUMN I applies to A only, B ONLY, BOTH A and B or NONE of the items in COLUMN II. Write A only, B only, BOTH A and B NONE next to the question number (1.3.1 to 1.3.3) Column I Column II Storage of chlorophyll A Lamella B Granum Products of anaerobic respiration in yeast cells A Alcohol B CO Helps maintain the oxygen carbon dioxide balance in the atmosphere A Cellular respiration B Photosynthesis (3X2) [6] 1.4 Study the diagrams below showing three investigations involving photosynthesis. Write only the letter of your choice next to the question number. A C Which of the investigation (A, B or C) gives off a gas, which causes a glowing splint to ignite. (1) Which investigation above (A, B or C) does not require the use a control. (1) Which investigation (A, B or C) is designed to test whether light is essential for photosynthesis. (1) [3] SECTION A = 20 MARKS 4

5 SECTION B QUESTION Study the diagram of the skull below and answer the questions that follow Does this skull belong to a herbivore, carnivore or omnivore? (1) Which type of teeth is most common in this skull? (2) Explain why the animals has mostly the types of teeth mentioned in 2.1.2? (2) [5] 2.2 According to a study, the incidence of obesity in different communities is as follow. Study the results represented in the table and answer the questions that follow. Race group Black White Coloured Indian % obesity in men ,6 % obesity in women Draw a bar graph to show the percentage obesity for men and women from the race groups. (8) Which groups of males and females have the greatest percentage obesity? (2) Provide TWO ways in which the incidence of obesity among South Africans can be reduced. (2) [12] 5

6 QUESTION Study the diagram below and answer the questions that follow. Gas B Gas A X C Y Gas A Gas B H 2 O Identify the organelle labelled X. (1) Name the metabolic process takes place in organelle Y. (1) Tabulate TWO differences that occur between the metabolic processes in organelle X and Y. (5) Identify the gas labelled A and B respectively. (2) List TWO ways in which the process associated with organelle X is biologically important. (2) Draw a labelled drawing of the organelle labelled Y. (4) [15] 6

7 3.2 In an experiment to investigate the release of energy in the form of heat by germinating seeds, three thermos flasks were set up as shown. The seeds in A were germinating, but those in B had been baked and washed in formalin while those in C were baked but not washed in formalin. A B C Germinating seeds thermometer damp cotton wool Baked seeds washed in formalin Baked seeds Readings of the temperatures in the three flasks were taken simultaneously at intervals of 12 hours, starting on Monday at 20:00, and the results were tabulated below. Study the information in the table and answer the questions that follow. Flask A o C Flask B o C Flask C o C Monday Tuesday Wednesday Thursday Friday 08:00 20:00 08:00 20:00 08:00 20:00 08:00 20:00 08:00 20:00-15,0 14,8 15,5 15,7 17,4 17,7 17,7 18,0 17,9-15,0 14,4 14,8 14,2 15,3 15,0 14,9 14,9 14,7-15,0 14,5 14,8 14,4 14,9 15,0 15,3 15,4 15, What is the function of washing the beans in flask B in formalin? (1) What is the temperature difference between flask A and flask B on Friday morning? (2) Provide a possible reason for the difference in temperature in flask A and C. (3) Why was the cotton wool placed in the mouth of all three flasks kept moist? (2) [8] SECTION B = 40 MARKS 7

8 SECTION C QUESTION Describe how the products of the light phase are used in the dark phase of photosynthesis to manufacture organic compounds such as glucose, and how this glucose is broken down in the cells to release energy. Content: 17 marks Synthesis (Relevance, the logical sequence and comprehension of facts): 3 marks NOTE: NO MARKS WILL BE AWARDED FOR ANSWERS IN THE FORM OF FLOW CHART, DIAGRAMS OR TABLES [20] NOTE: No marks will be awarded for answers in the form of flow charts, diagrams or tables. SECTION C = 20 MARKS GRAND TOTAL: 80 MARKS 8

9 SPINE ROAD HIGH SCHOOL VIA AD SUCCESSORUM LIFE SCIENCES GRADE 11 CONTROL TEST MEMORANDUM TIME: 1½ hours MARKS: 80 EXAMINER: T. GABRIELS MODERATOR: Z. SHADE INSTRUCTIONS: Read the following instructions carefully before answering the questions. 9. Answer ALL the questions. 10. Skip a line between every sub question e.g and Start EACH question on a clean page. 12. Write ALL answers on the ANSWER SHEETS. 13. Start the answers to EACH question at the top of a NEW page. 14. Number the answers correctly according to the numbering system used in this question paper. 15. Write neatly and legibly. 16. ALL drawings should be done in pencil and labelled in blue/black ink. 9

10 SECTION A QUESTION A A B C [4X2=8] ATP Greenhouse Anaerobic respiration [3X1=3] Both A and B Both A and B B only [3X2 =6] A (1) A (1) B (1) [3] SECTION A = 20 MARKS SECTION B QUESTION Herbivore (1) Premolars and molars (2) The animal needs to grind and crush the plant material so it can be digested. (2) [5]

11 Mark allocation: Correct type of graph Correct label for Y-axis Appropriate scale for Y-axis: correct values, equal intervals between the values Plotting of the bars: - draws all 4 sets of bars correctly ( ) - draws 3 sets of bars correctly ( ) - draws 2 sets of bars correctly ( ) - draws 1 set of bars correctly ( ) Correct legend / key provided (8) White males and black females (2) Awareness campaigns about the dangers of obesity Encourage participation in physical activity and sport Encourage healthy eating fruit and vegetables should be less expensive Programmes to help people lose weight should be freely available to all South Africans. [Mark the first TWO only] (2) [12] QUESTION X = Chloroplast (1) Y = Cellular respiration (1) Differences between photosynthesis and respiration (any two valid comparisons): Photosynthesis Occurs during the day in the presence of light Cellular Respiration Occurs during the day and at night (not dependent on light) ( ) Anabolic process Catabolic process ( ) Uses carbon dioxide and releases Uses oxygen and releases carbon oxygen dioxide ( ) Main product is glucose/sugar/starch Main product is energy-rich ATP ( ) 1 mark for the table. (5) A = O 2 (1) B = CO 2 (1) Produce oxygen, which human beings need for cellular respiration. 11

12 - Use up the carbon dioxide, which is produced by humans beings during cellular respiration. - Produce food (glucose) for human beings. Plants are the basis of all food chains. [ mark first TWO] (2) Drawing (4) [15] It prevents the growth and cellular respiration of micro organism. (1) , 0 14, 9 = 3,1 o C (2) Flask A the germinating seeds undergo the cellular respiration and release a lot of heat as glucose is broken down. In Flask B the seeds are baked and enzymes has denatured but not sterilised so micro organism will undergo cellular respiration and release energy. (3) Germinating seeds require water for cellular respiration and to reduce the effect of the environmental temperature. (2) [8] SECTION B = 40 MARKS SECTION C QUESTION 4 The products of the light phase are ATP and energised hydrogen provides the energy for this process. Which is required in the dark phase and oxygen is released into the atmosphere. The reactions of the dark phase take place in the stroma of the chloroplast. Carbon dioxide enters from the atmosphere combine with hydrogen atoms to form glucose. The reaction of the dark phase is controlled by enzymes. any (7) Cellular respiration glucose is broken down during this process Glycolysis Occurs in the cytosol just outside the mitochondria. This phase requires no oxygen. 12

13 The glucose molecule (consist of 6C) is broken down step by step. Two molecules of pyruvic acid (3C) are formed. The energy rich Hydrogen atom release energy and stored in ATP. Co enzymes carry the Hydrogen atoms to the next phase Krebs cycle Only occurs if OXYGEN is present. Pyruvic acid (3C) enters the mitochondria. Pyruvic acid used in a cyclic series of reactions. Energy rich Hydrogen atoms and CO 2 is released. Energised hydrogen atoms combines with co enzymes. and transmitted to the next phase. CO 2 leaves the cell as a product of cellular respiration. Oxidative Phosphorylation H + atoms from the Krebs cycle are carried by co enzymes. H + atoms transferred from on hydrogen acceptor to the next, then energy is released Energy released combines with ADP and with a phosphate (cristae) to form ATP. Oxygen is the final hydrogen acceptor. Oxygen and TWO H + atom to form WATER H 2 O. Any (10) Content: (17) Synthesis (3) (Relevance, the logical sequence and comprehension of facts) Criterion Relevance (R) Logical sequence (L) Comprehensive (c) Generally All information provided is relevant to photosynthesis Ideas are arranged in a logical sequence for the process of photosynthesis and cellular respiration All aspects of cellular respiration is provide to give insight on how glucose is broken down SECTION C = 40 MARKS GRAND TOTAL: 80 MARKS 13