8 . G11 LifeSciences DigitalSupport web Practice Examination Paper 1

Study & Master Support Pack | Grade 11 CAPS Life Sciences Practice Examination: Paper 1 This support pack consists of a Practice examination paper for Paper 1 of the Life Sciences Grade 11 CAPS curriculum and provides valuable practice in writing the examinations. An answer memo is provided separately for you to check the learners' answers. Learners can work through these individually at home or these could form the basis of a catch-up class or online lesson. You have permission to print or photocopy this document or distribute it electronically via email or WhatsApp. Cambridge University Press Africa is a proudly South African publisher. For more information on our Study & Master CAPS-approved textbooks and valuable resource materials, visit www.cambridge.org Brighter thinking | Better learning Practice Examinations Paper 1 www.cambridge.org

Life Sciences Examination: Exemplar Paper 1 Marks: 150 Time : 2 hours 30 minutes Instructions and information Read the following instructions carefully before answering the questions. 1 Answer ALL the questions. 2 Write ALL the answers in your ANSWER BOOK. 3 Start the answers to each question at the top of a NEW page. 4 Number the answers correctly according to the numbering system used in this question paper. 5 Present your answers according to the instructions of each question. 6 ALL drawings should be done in pencil and labelled in blue or black ink. 7 Draw diagrams or flow charts only when asked to do so. 8 The diagrams in this question paper are NOT necessarily all drawn to scale. 9 Do NOT use graph paper. 10 You may use non-programmable calculators, protractors and compasses. 11 Write neatly and legibly. Practice Examinations Paper 1

Section A Question 1 1.1 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 1.1.5) in your ANSWER BOOK, for example 1.1.6 d. 1.1.1 The following are involved in the process of cellular respiration: i energy ii carbohydrates iii carbon dioxide iv water v oxygen Which ONE of the following combinations correctly represents their involvement in the above process? a ii + iii = i + iv + v b ii + iv = i + iii + v c i + ii = iii + iv + v d ii + v = i + iii + iv 1.1.2 Which of the following statements is true for respiration and photosynthesis? a only photosynthesis involves the conversion of energy in living cells b take place only in cells that contain chlorophyll c both can take place simultaneously in plant cells d photosynthesis involves catabolic reactions, while respiration involves anabolic reactions 1.1.3 Which one of the following occurs in both aerobic and anaerobic respiration? a carbon dioxide is released b energy is released from food c carbon dioxide and water are released d both processes are the reverse of photosynthesis 1.1.4 Listed below are steps in a test for starch in green leaves: iii boil leaves in alcohol iii boil leaves in water for two minutes iii immerse leaves in iodine solution iv rinse leaves in water From the list above, in what sequence are these steps carried out? a ii, i, iii, iv b i, ii, iii, iv c ii, i, iv, iii d iv, i, iii, ii Practice Examinations Paper 1

1.1.5 A group of learners set up an investigation to test the effect of light on the rate of photosynthesis. They counted the number of bubbles of gas given off by the water plant as the lamp was moved away from the plant. bubbles of gas lamp water plant Which one of the following graphs best shows the expected results? a b c d rate rate rate rate distance distance distance distance (5 × 2) [10] 1.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1–1.2.6) in your ANSWER BOOK. 1.2.1 The green pigment in leaves that absorbs radiant energy 1.2.2 The process in plants during which radiant energy is converted into chemical energy 1.2.3 The light independent phase of photosynthesis 1.2.4 The chemical used to test for the presence of starch 1.2.5 Energy carrier in the cell 1.2.6 The part of a chloroplast in which the light-independent reactions of photosynthesis take place [6] 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, or none next to the question number (1.3.1–1.3.5) in your ANSWER BOOK. Column I Column II 1.3.1 Product/s of cellular respiration a water b oxygen 1.3.2 Energy is released a aerobic respiration b anaerobic respiration 1.3.3 Glycolysis occurs in a cytoplasm b mitochondrion 1.3.4 Product/s of photosynthesis a oxygen b glucose 1.3.5 Increases photosynthesis until an optimum a light intensity level is reached b carbon dioxide concentration (5 × 2) [10] Practice Examinations Paper 1

1.4 Study the diagram below and answer the questions that follow. B A C D E sphincter muscle F 1.4.1 Label parts B and F. (2) 1.4.2 List THREE substances present in A that are normally absent in D. (3) 1.4.3 State ONE function of E. (1) 1.4.4 List THREE functions of C. (3) [9] 1.5 Study the diagram below and answer the questions that follow. I A H B C G D F E Part of the human digestive system 1.5.1 Label parts A, E, F and H. (4) 1.5.2 Write the letter of the part: a that represents both an endocrine and exocrine gland (1) b where protein digestion begins (1) c where most water and mineral salts are absorbed (1) d that stores bile (1) [8] Practice Examinations Paper 1

1.6 Study the diagram below and then answer the questions. A G F B C E D Structure of the human respiratory system 1.6.1 Provide labels for the parts A, B, D and F. (4) 1.6.2 State ONE function of each of the following: a the fluid in part E (1) b the cartilagenous rings in part B (1) c the epithelial tissue that lines the inside of part G (1) [7] Total Section A: [50] Section B Question 2 2.1 Study the diagram of a Malpighian body below and answer the questions that follow. A B C D E Malpighian body of a human kidney 2.1.1 Identify the parts labelled A, D and E. (3) 2.1.2 Explain the advantage of part B having a smaller diameter than part A. (2) 2.1.3 Name the liquids present in parts C and D respectively. (2) 2.1.4 Which blood vessel (A or B) contains more urea? (1) 2.1.5 State ONE difference in the composition of the liquids in parts C and D. (2) 2.1.6 Explain why heart failure can sometimes lead to kidney failure. (3) 2.1.7 Name the type of cells that make up the wall of part E. (1) [14] Practice Examinations Paper 1

2.2 In an investigation to determine whether light is necessary for photosynthesis a leaf was obtained from a plant that was first placed in a dark cupboard for 48 hours before it was again exposed to light. Refer to the diagram below to answer the questions that follow. cardboard Leaf subjected to test to determine whether light is necessary for photosynthesis 2.2.1 Why was the plant placed in a dark cupboard? (2) 2.2.2 Why is only part of the leaf covered with cardboard? (2) 2.2.3 Draw a labelled diagram of the leaf to show the results after the starch test at the end of the investigation. (3) [7] 2.3 The following information appears on the package of a brand of cereal eaten by a young boy. Study it and then answer the questions based on it. Nutritional composition of cereal: Ingredients Nutritional information (values per 100 g) Whole rolled oats, roasted wheat flakes, Energy 2 000 kJ cane syrup, brown sugar, vegetable oil, Protein 12,5 g sundried raisins Carbohydrates 50 g Fats 12,5 g Fibre 25 g Cholesterol 0 mg 2.3.1 The total energy value of a 100 g cereal is 2 000 kJ. The boy requires 5 500 kJ of energy per day. How much cereal does he need to eat in order to obtain this (assuming that he does not eat any other foods)? Show ALL calculations. (3) 2.3.2 Draw a pie chart to illustrate the relative proportions of protein, carbohydrate, fats and fibre of this 100 g of cereal. (8) [11] 2.4 Study the diagram below and then answer the questions that follow. blood vessel D B A C large complex molecule Diagrammatic representation of a portion of the digestive system 2.4.1 Name the processes represented by arrows: a A (1) b B (1) Practice Examinations Paper 1

2.4.2 Explain the role of water in process B. (2) 2.4.3 Identify the finger-like projections found on D. (1) 2.4.4 If the large, complex molecule is a protein, name molecules C. (1) 2.4.5 Explain what happens to the excess of molecules C in the body. (2) [8] 2.5 Describe gaseous exchange at the lung surface/alveoli in humans. [10] Total Question 2: [50] Question 3 3.1 Differentiate between the following concepts: cellular respiration, breathing, and gaseous exchange. [6] 3.2 Two organelles in the green parts of plants are responsible for different but closely related processes. Study the flow diagram below and then answer the questions that follow. Sun gas A C water organelle I organelle II gas B 3.2.1 Name: a  organelles I and II (2) b gases A and B respectively (2) c  the processes occurring at organelle I and organelle II respectively (2) d product C. (1) 3.2.2 Explain TWO structural adaptations of organelle II for its function. (4) [11] Practice Examinations Paper 1

3.3 Study the graph below and then answer the questions. The estimated prevalence of diabetes 20 by age and sex in South Africa, 2005 15,1 14,7 15,0 15 Prevalence (%) 10,7 11,2 10 9,7 9,6 7,7 5 1,6 1,3 0 30–44 45–59 60–69 70–79 80+ Age group (years) male female 3.3.1 Which female age group has the greatest prevalence of diabetes? (1) 3.3.2 Which male age group has the greatest prevalence of diabetes? (1) 3.3.3 Describe TWO general trends/conclusions that you may be able to infer from the data. (4) 3.3.4 In which group of people is the prevalence of diabetes greater? (1) 3.3.5 Suggest TWO reasons for this pattern. (4) [11] 3.4 The average number of red blood cells in the blood of people living at different altitudes (height above sea level) is shown in the table below. Each reading is the average for ten adult men who have lived at that altitude for at least four months. Altitude (metres) Average number of red blood cells (millions/mm3 of blood) 0 5,1 1 500 5,3 3 000 5,4 4 500 5,6 6 000 5,9 7 500 6,2 The winning times in three different events at the Olympic Games held in different cities around the world are shown in the table below. Each city is located at a different altitude. Cities Altitude Events (metres) 800 m 5 000 m 10 000 m TOKYO 200 1 min 45,1 sec 13 min 44,8 sec 28 min 24,4 sec MEXICO CITY 2 240 1 min 44,3 sec 14 min 28,4 sec 29 min 27,9 sec MUNICH 52 1 min 45,9 sec 13 min 26,4 sec 27 min 38,4 sec 3.4.1 State ONE generalisation that can be made from the first table about the average number of red blood cells and altitude. (2) 3.4.2 Why was the average number of red blood cells for ten individuals used rather than the red blood cell count of only one person? (2) 3.4.3 Describe the general relationship between performance by athletes and altitude. (2) 3.4.4 Which events are greatly influenced by the altitude? (2) 3.4.5 During the Mexico City Games, athletes from East Africa (which is 2 000 m above sea level) were more successful than their competitors from the lower altitudes. Suggest a physiological explanation for this. (2) [10] Practice Examinations Paper 1

3.5 Study Figures A, B and C below and then answer the questions that follow. Figure A: Graph showing the relationship between Figure B: The water balance on hot and cold days tubular reabsorption of water in the kidney and the level of ADH Hot day Cold day A 8 profuse little sweating sweating 7 6 Level of ADH 5 pituitary gland 4 3 2 B high ADH low ADH 1 0 106 108 110 112 114 116 118 120 concentrated dilute urine urine Tubular reabsorption in ml/minute Figure C: Water and salt balance in the human body urine water 2 water loss input liquids consumed 3 2 4 3 body water + salt 3.5.1 What relationship exists between the level of ADH and tubular reabsorption of water? (2) 3.5.2 What effect does increased ADH have on the renal tubules? (2) 3.5.3 What would you expect the circumstances of the body to be at A on the graph in Figure A? (2) 3.5.4 With reference to Figure B, explain why ADH levels may be relatively low on a cold day? (2) 3.5.5 Describe how the salt balance is maintained in the body. (4) [12] Total Question 3: [50] Total Section B: [100] TOTAL: [150] Practice Examinations Paper 1