Life Sciences Grade 10 March Test 2016 Paper & Memo

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Life Sciences Down loaded from h layiso . GAUBi6 Common Test NSC - Grade 10 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. 2. 3, 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. ALL drawings must be done in pencil and labelled in blue or black ink. Draw diagrams, flow charts or tables 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

Life Sciences SECTION A QUESTION 1 Downloaded from hlayiso,co arch 2016 Common Test NSC — Grade 10 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. 4.1.1 Which ONE of the following statements is TRUE about mitosis? A B Cc D A somatic cell divides to form two unidentical cells It forms cells to repair and replace worn out or damaged tissue The daughter cells formed have half the number of chromosomes as the mother cell It leads to the formation of gametes in humans 1.1.2 The organelle that is responsible for packaging and secreting enzymes is the ... A B Cc D mitochondrion. chloroplast. golgi body. endoplasmic reticulum. 1.1.3 When viewing a specimen the total magnification is 600x. If the magnification on the eyepiece is 10x then the magnification on the objective lens is... A. B. Cc. D. 6x 60x 200x 600x 4.1.4 The actual size of the cell shown below when measured between points A and Bis ... voOwWwPY Copyright Reserved Onion cell (x200) 2mm 0,2 mm 5mm 20 mm Please Turn Over

Life Sciences Down loaded from h layiso WPMD common Test NSC — Grade 10 1.1.5 A scientist carried out an investigation on the rate of diffusion under three temperature conditions: 15°C, 25°C and 35°C. Which ONE of the following statements applies to the above investigation? A B Cc D Copyright Reserved Temperature is the dependent variable A possible hypothesis is that an increase in temperature will lead to a decrease in the rate of diffusion The aim is to investigate whether the rate of diffusion has an effect on the temperature For the investigation to be valid, the temperature should be kept constant (5 x 2) [10] TOTAL SECTION A: 10 Please Turn Over a

) Downloaded from hlayiso,cgm NSC — Grade 10 Life Sciences SECTION B QUESTION 2 ommon Test 2.1 The diagram below shows part of a cell as seen under an electron microscope. E D 2.1.1 Does the diagram represent a plant or animal cell? 2.1.2 Give TWO visible reasons for your answer. 2.1.3 Identify the small round structures C. 2.1.4. Give ONE function of: (a) PartA (b) Part D. (1) (2) (1) (2) 2.1.56 Explain ONE property of part B that helps it in carrying out its function. (2) 2.1.6 State what would happen if the part labelled F was removed from the cell. (1) 2.1.7 Explain why you would expect part E to be found in large numbers in muscle cells. ‘ 2.2. Explain how the excess use of fertilisers may lead to eutrophication Copyright Reserved (2) (11) (4) [15] Please Turn Over

Life Sciences NSC — Grade 10 QUESTION 3 3.1. Read the passage below and answer the questions. Cells may begin to malfunction in the body. This results in cancer. This condition may be caused by cells dividing by mitosis in an uncontrolled manner. Abnormal number of cells may cause appearance of tumours (swellings of body parts). Tumours may be benign or malignant. Radiation from the sun may cause skin cancer. Tar in cigarette is carcinogenic and can cause lung cancer. Viruses are considered as the major cause of human cancer like cervical cancer and liver cancer. At present time certain diet and lifestyle increase risk of cancer. Cancer can be treated in different ways. 3.1.1 Name the disease that is caused by an uncontrolled cell division. 3.1.2 What term is used for substances that can cause cancer? 3.1.3 From the passage, state the causes of the following types of cancer: (a) Cervical cancer (b) — Skin cancer (c) Lung cancer Copyright Reserved Downloaded from hlayiSO.GOIM onmon tes (1) (1) (3) (5) Please Tum Over

Downloaded from hlayiso.com Life Sciences March 2016 Common Test NSC — Grade 10 3.2 Study the following diagrams representing different phases of mitosis. 1 2 (rome, ) f } SS ks, ~ rah oy pay mA | YY YW \ i / Mba yg’ VAY! ‘ ie weet 7 3.2.1 Identify part B. (1) 3.2.2 State the function of part labelled A. (1) 3.2.3 Use the NUMBERS ONLY to arrange the phases of mitosis into the correct sequence from the above diagrams. (3) 3.2.4 How many chromosomes would be found in the daughter cells at the end of mitosis? (1) 3.2.5 Identify the phase of mitosis shown by diagram 3. (1) 3.2.6 Give a reason for your answer in QUESTION 3.2.5. (2) 3.2.7 Name the phase of mitosis that is missing from the above diagrams. (1) (10) [15] SECTION C QUESTION 4 Organic compounds play an important role in the structure and functioning of a cell, In this regard describe: (a) The test for glucose in food items (5) (b) The biological importance of lipids (3) (c) THREE properties of enzymes (9) Content: (17) Synthesis: (3) [20] NOTE: NO marks will be awarded for answers in the form of flowcharts, tables or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright Reserved

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