LIFE SCIENCE JUNE 2015 QP and MEMO 2 hlayiso.com

MARKS: 150 | TIME: 2% hours Basic Education SRRRRHRE TREK RRR SRR RRR RRS SRST RR RRR * LIFE SCIENCES N.B. This question paper consists of 12 pages. KwaZulu-Natal Department of Education REPUBLIC OF SOUTH AFRICA COMMON TEST JUNE 2015 x scot lease Tt ws

Lite sciences DOwnloaded from hlayiso.cQim, sect June 2018 NSC INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. Answer ALL the questions. 2. Write ALL the answers in the 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 must be done in pencil and labelled in blue or black ink. 7. Draw diagrams, flow charts or tables only when asked to do so. 8. The diagrams in this question paper are NOT necessarily drawn to scale. 9. Do NOT use graph paper. 10. You must use a non-programmable calculator, protractor and compass where necessary. 11. Write neatly and legibly. Copyright Reserved Please Turn Over

Down loaded from h layiso,, com, June 2015 Life Sciences comm NSC SECTION A QUESTION 1 1.1 Various options are given as possible answers to the following questions. Choose the 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 B. 1.1.1 Chloroplasts ... A play a role in heredity. B absorb radiant energy during photosynthesis. C control all vital activities of plant cell. D control all substances entering the plant cell. 1.1.2 Study the list below. “4 (i) Not smoking (ii) Eating a healthy diet (ii) Drinking alcohol (iv) Eating low fibre (v) Using sunscreens Which ONE of the following combinations are strategies that may reduce the risk of cancer? A (i), (ii) and (iii) only B (ii), (ii) and (iv) only C (ili), (iv) and (v) only D (i), (ii) and (v) only 1.1.3. The diagram below represents a transverse section of a young plant root. Which ONE of the following combinations are the correct labels for the parts numbered 1, 2 and 3? 4 2 3 A Xylem Epidermis Endodermis B Stele Cortex Epidermis c Pericycle Endodermis Epidermis D Vascular cylinder | Pith Pericycle Copyright Reserved Please Turn Over

Lite Selences DOWnloaded from hlayiSO.CQIMN, test sune 2016 1.1.4 All of the following are phases of mitosis except ... A __ prophase. B telophase. C _ interphase. D anaphase. 1.1.5 Study the list of tissues below. (i) Squamous tissue (ii) Blood tissue (iii) Cuboidal tissue {iv) Tendon Which ONE of the following combinations represents examples of connective tissues? A (i) and (ii) only B (ii) and (iil) only C (i) and (iv) only D (ii) and (iv) only (6x2) (10) 4.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.10) in the ANSWER BOOK. 1.2.1 A tissue that gives rise to new xylem and phloem 1.2.2 Atissue in plants that transports manufactured food 1.2.3 The type of epithelium consisting of a thin, single layer of cells 1.2.4 The process during which the cytoplasm divides after the nucleus divides 4.2.5 The structure in the living cell controlling the activities of the cell 1.2.6 The process by which DNA produces identical copies of itself 4.2.7 An organelle in a plant cell that stores starch 1.2.8 The phase in mitosis where two identical cells result 1.2.9 A pore in the epidermis of a leaf surrounded by two guard cells 4.2.10 The cells in a leaf with large intercellular air spaces between them (10x) (10) Copyright Reserved Please Turn Over

Life Sciences NSC Downloaded from hlayiso,.co ‘ommon Test June 2015 1.3 Indicate whether each of the statements in COLUMN | 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 to 1.3.5) in the ANSWER BOOK. COLUMN | COLUMN II 1.3.1 Found in the human vertebral column A: Scapula B: Atlas ( 1.3.2 Strengthening tissue in young dicot stern A: Phloem B: Parenchyma 1.3.3 Structure that provides plant cells with support | A: Cell wall B: Nucleus 1.3.4 Phase in which the nuclear membrane A: Prophase | reappears B: Metaphase | 1.3.5 Waxy layer reducing water loss A; Cuticle B: Cortex (6x2) (10) ( } 4.4 Study the diagram below, which shows a phase in mitosis. A centromere chromatid 1.4.1 Identify the phase of mitosis represented by the diagram. 1.4.2. What is the role of part A during the phase mentioned in QUESTION 1.4.1? 1.4.1. How many chromosomes are shown in the diagram? 1.4.2. How many chromosomes would be found In the daughter cells at the end of mitosis? 1.4.3 Describe the events taking place in the phase before the one shown in the above diagram. 1.4.4 State THREE ways in which mitosis is biologically important. Capyright Reserved (1) (1) (1) (4) (3) (3) (10) Please Turn Over

Downloaded from hlayiso.com Life Sciences Common Test June 2015 NSC 1.5 Study the table below which shows the results of certain tests on FIVE different food types: A, B, C, D and E. FOOD | BENEDICT’S/ IODINE TEST | BIURET/ TYPE | FEHLING’S TEST MILLON’S TEST A Orange Yellow Pale blue/ white B Biue Blue black Pale blue/ white Cc Orange Yellow Purple/ brick red D Blue Blue black Purple/ brick red E Orange Blue black Purple/ brick red 1.5.1. Which food type (A, B, C, D or E) contains the following: a) Only starch (2) b) Only glucose (2) c) Only protein and glucose (2) d) Starch, glucose and protein (2) 1.5.2 Rice contains starch and protein but no glucose. Which food type (A, B, C, D or E) is probably rice? ~ (2) (10) TOTAL SECTIONA 50 Copyright Reserved Please Turn Over

Downloaded,from hlayisQ, GOW sine 2015 Life Sciences NSC SECTION B QUESTION 2 2.1 Study the following diagrams and answer the questions that follow. tO} Last 2.1.1. Write down the LETTER and NAME of the part that is responsible for: (a) Facilitating transport of large molecules within cytoplasm (by Protein synthesis “yj (c) Providing turgidity to plant cells (6) 2.1.2 Would there be more of structure C in cells of the skin or cells of the muscles? (1) 2.1.3 Explain your answer in QUESTION 2.1.2. (3) 2.1.4 Tabulate THREE differences between a plant and an animal cell. (7) (17) 2.2 Study the diagram of enzyme action and answer the questions that follow. P rm 7 o 2.2.1 Provide labels for the parts N, O and P. (3) 2.2.2 What property of enzymes is illustrated in the above diagram? (1) 2.2.3 List TWO properties of enzymes other than the one mentioned in QUESTION 2.2.2. (2) (6) Copyright Reserved Please Turn Over

Downloaded from hlayisSoO.CQyMy test June 2015 Life Sciences NSC 2,3 The table below shows the composition of human milk and cow's milk per 100 ml. SUBSTANCE CoOw’s MILK HUMAN MILK Water 87,29 87,09 Protein 3.29 14g Fat 2,19 429 Carbohydrates 439 7.689 Calcium 410 mg 18 mg Iron 1,0 mg 0,9 mg Sodium 94 mg 14 mg Vitamin A 0.32 mg 0,32 mg Vitamin C 2mg 3,6 mg Vitamin D 0,5 mg 0.3 mg 2.3.1 From the table, name the: (a) Vitamin that forms the smallest constituent of cow's milk. (1) (b) Nutrient that is required to form part of the haemoglobin molecule. (1) (c) Vitamin that occurs in greater concentration in human milk than in cow's milk. (1) 2.3.2 State TWO reasons why proteins are required by human infants. (2) 2.3.3 If cow's milk is used for feeding human infants, it is diluted by adding water. Use information from the table to suggest a reason for diluting cow’s milk. (2) 2.3.4 Calculate the difference in the vitamin D content between human milk and cow's milk. Show your working, Copyright Reserved (3) (10) Please Turn Over

Life Sciences Downloaded from hlayiso.com NSC est June 2015 2.4 Study the line graph below showing the effect of light intensity on the rate of transpiration in leaves. Rate of transpiration {ml) a wa B w N B o Effect of light intensity on the rate of transpiration in leaves / 0 1 2 3 4 s Light intensity (In hours) 2.4.1 2.4.2 2.4.3 2.4.4 2.4.5 Copyright Reserved Identify the dependent variable in the above investigation. State the effect of increasing the light intensity from 0 to 2. Explain why an increase in light intensity above 2 does not increase the rate of transpiration much further. List TWO factors that should be kept constant in the above investigation. Why should the factors mentioned in QUESTION 2.4.4 be kept constant when conducting the investigation? (1) (1) (2) (2) (1) (7) [40] Please Turn Over

Life Sciences QUESTION 3 Downloaded from hlayiso.goMmas sue 2018 NSC 3.1 Study the diagram below of a root hair cell. 3.1.4 3.1.2 3.1.3 3.1.4 Identify parts A and B. Explain TWO ways in which root hair is adapted for the absorption of water. Explain TWO ways in which the xylem tissue is adapted for transporting water. Explain why a high temperature in the soil will increase absorption of water by the root hair. 3.2 Study the diagram below. 3.2.1 3.2.2 3.2.3 Copyright Reserved Identify the tissue shown above. Describe the role played by this tissue in the trachea of a human. How is a similar tissue in the alimentary canal different from the one represented above? (2) (4) (4) (2) (12) (4) (3) (4) (8) Please Turn Over ( )

Downloaded from hlayiso,com Life Sciences Common Test June 2015 NSC 3.3 Read the passage below and answer the questions. Soccer players around 35 years old and above usually experience problems with their ligaments and tendons. Tendons are long fibres, made of tough connective tissue, attaching muscles to bone. They have a large number of white non elastic fibres. Tendons are inelastic. This allows them to transmit the forces of contraction and relaxation to the bones so that movement can take place. Ligaments are long fibres made up of tough connective tissue. They join bone to bone and have a large number of yellow elastic fibres. They can stretch to allow bones to move at joints 3.3.1. Based on the text above state: (a) ONE structural difference between ligaments and tendons (2) (b) ONE functional difference between ligaments and tendons (2) (c) The type of tissue making up tendons and ligaments (1) 3.3.2 Explain why tendons need to be inelastic. (2) 3.3.3 What would happen if ligaments were made up of inelastic fibres? (2) 3.3.4 If you dislocate your shoulder once, it may happen more easily at another time. Explain why you think this is so. (2) 3.3.5 Suggest TWO things that athletes can do to prevent injuries to their ligaments and tendons (2) (13) “33.4 An investigation was conducted in four different provinces in South Africa to 7 determine the percentage of people living with arthritis. The results of the investigation are shown in the table below. PROVINCE PEOPLE WITH ARTHRITIS (%) Kwazulu-Natal 24 Gauteng 48 Eastern Cape 18 Limpopo 10 3.4.1 Draw a pie chart to represent the data in the table. (6) 3.4.2 State TWO symptoms of arthritis. (2) 3.4.3 Explain why the hands, neck, knees and feet are mostly affected by arthritis. (2) (10) [40] Copyright Reserved Please Turn Over

Down loaded from h layiso. com. Test June 2015 NSC Life Sciences SECTION C QUESTION 4 Explain how the shape and cell wall features of epidermal, phloem and spongy mesophyll tissues are suited to their function in the plant body. Content: (17) Synthesis: (3) (20) NOTE: NO marks will be awarded for answers in the form of tables, flowcharts or diagrams. TOTAL SECTION CG: 20 GRAND TOTAL: 150 Copyright Reserved

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