Life Sciences Grade 10 March Test 2017 Paper & Memo

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Life Sciences Downloaded from hlayiso.com March 2017 Common Test 2 INSTRUCTIONS AND INFORMATION ° Read the following instructions carefully before answering the questions. 1. 2. 10, 11. Answer ALL the questions. Write ALL the answers in the ANSWER BOOK. Start the answers to EACH question at the top of a NEW page. Number the answers correctly according to the numbering system used in this question paper. Present your answers according to the instructions of each question. Make ALL drawings in pencil and label them in blue or black ink. Draw diagrams, tables or flow charts only when asked to do so. The diagrams in this question paper are NOT necessarily drawn to scale. Do NOT use graph paper. You must use a non-programmable calculator, protractor and a compass, where necessary. Write neatly and legibly. Copyright Reserved Please Turn Over

2 ET a m g g a S a a Life Sciences SECTIONA QUESTION 1 017 Common Test Downloaded fram hlayiso.con 11 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. 1.4.1 1.1.4 Copyright Reserved The layer surrounding the vacuole is known as the ... A cell membrane. B tonoplast. Cc nuclear membrane. D cell wall. Study the functions listed below: (i) Forms a protective layer in a plant cell (ii) Site for glucose synthesis (li) | Gives shape to a cell (iv) Site for protein synthesis Which ONE of the following describes the function of the ribosome? A (i) only B (i) and (ii) only Cc (ii) and (iv) only D (iv) only In which phase of mitosis does the nucleolus and nuclear membrane start to disappear? A Telophase B Anaphase Cc Prophase D Metaphase The element required for the formation of haemoglobin is ... A calcium. B iodine. Cc iron. D phosphorous. One of the symptoms of the disease scurvy is ... abnormal bone formation. skin eczema. night blindness. bleeding gums. DUOW>S (10) TOTAL SECTION A: 10 Please Turn Over

_ Downloaded from hlayiso.com Life Sciences NSC March 2017 Common Test 4 SECTION B QUESTION 2 2.1 Study the diagram below showing a phase of mitosis. 2.1.1 State the phase of mitosis represented in the diagram above. (1) 2.1.2 Give the LETTER and the NAME of the part that allows you to identify the above diagram as representing an animal cell, (2) 2.1.3 Identify parts B and C, (2) 2.1.4 How. many chromosomes will be present in each cell at the end of mitosis? (1) 2.1.5 What do you think will happen during cell division if part A is damaged? (1) 2.1.6 Explain the importance of interphase. ; (2) (9) Copyright Reserved Please Turn Over

Life Sciences Downloaded from hlayiso.com NSC March 2017 Common Test 5 2.2 An investigation was carried out to determine the effect of a detergent containing fat-digesting enzymes on a fat stain. The procedure was as follows: * Two identical cloths were used. * Cloths A and B had identical fat stains. * Cloth A was washed using a detergent not containing fat-digesting enzymes for five minutes at 37°C. * Cloth B was washed using a detergent containing fat-digesting enzymes for five minutes at 37°C. The diagram below shows the results of the investigation. Cloth A Cloth B Fat stain 2.2.1 2.2.2 2.2.3 2.2.4 Copyright Reserved State a conclusion for this investigation. State TWO factors that were kept constant during this investigation. What was the purpose of cloth A in the investigation? State what should have happened to the enzymes if cloth B was washed in boiling water. (2) (1) (6) [15] Please Turn Over

Life Sciences Down loaded from, h layiso. COM...n 2017 Common Test 6 QUESTION 3 3.1 The graph below shows the activity of enzymes A and B. - mam wm 4 ow IN a Enzyme activity hs Le IN ~ By NY »~ o 4 2 38 4 6&6 6 7? & 9 pH 3.4.1 Which property of enzymes is shown in the graph? (1) 3.1.2 State one pH value at which the activity of enzymes A and B is the same. (1) 3.1.3 What is the best pH for the activity of enzyme A? (1) 3.1.4 Explain why enzymes A and B cannot function in the same part of the human digestive system. (2) (5) Copyright Reserved Please Turn Over

Life Sciences Downloaded from hlayiso.com 7 March 2017 Common Test 3.2 Study the diagram below showing organelles found in a cell, 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 Copyright Reserved Write down the LETTER only of the part that: (a) Contains chlorophyll (1) (b) Has a secretory function (1) State TWO organic compounds that make up part E. (2) State TWO visible reasons why this diagram represents a plant cell.(2) Explain ONE consequence if the organelle D is damaged. (2) List TWO functions of organelle A. (2) (10) [15] TOTAL SECTION B: — (30) Please Turn Over

‘Downloaded from hlayiso.com Life Sciences . NSC March 2017 Common Test 8 SECTION C QUESTION 4 Various organic compounds play a role in the structure and functioning of cells. To aid in this functioning, many substances may enter or leave these cells in different ways, When growth and repair is required, these cells divide to form new cells. When these cells divide abnormally, a cancer may result. Provide a description for each of the following: 1. The method used to test for the presence of starch in an unknown sample (5) 2. Methods by which substances move through a membrane (8) 3. Causes and treatment of cancer (4) Content: (17) Synthesis: (3) (20) NOTE: NO marks will be awarded for answers in the form of flowcharts or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright Reserved

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