Life Sciences Grade 10 KwaZulu Natal June 2019 Paper & Memo

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Downloaded from hlayiso.com Life Sciences 2 Common Test June 2019 Grade 10 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. . 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. Do 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 may use a non-programmable calculator, protractor and a compass. Write neatly and legibly. Copyright reserved Please turn over

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Life Sciences Downloaded from hlayiso.com 4 Common Test June 2019 Grade 10 1.1.5 A grade 10 learner placed a clear plastic ruler across the centre of the of view of a compound light microscope as shown below. A row of cells was seen under low- power magnification. DOOO PTT TT TT tT TT TTT TTY Plastic ruler imm imm = 1000 pm What is the average length of a single cell in micrometres (um)? A 2000 pm B 10um C 200 um D 100 um 1.1.6 Living organisms such as animals have different levels of organisation. Study the diagram below and choose the structure represented by the LETTER X on the diagram. Organism Organ system Organ xX Cell A Tissue B Stomach C_ Intestines D Gut Copyright reserved Please turn over

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Life Sciences alee) Copyright reserved Downloaded from hlayiso.com 6 Common Test June 2019 Grade 10 The diagram below shows a special type of animal cell. Study the diagram and the four statements about it then answer the question based on it. 2, » a (i) It is found between the spinal cord and the effector muscles (ii) It carries impulses from the dendrites to the motor end plate (iii) It is myelinated (iv) It is connected directly to the receptors. Which TWO of the above statements about this cell are BOTH INCORRECT? Statements 1 and 2 Statements 2 and 3 Statements 3 and 4 Statements 1 and 4 0DOUDLY (10 x 2) (20) Please turn over

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Life Sciences Downloaded from hlayiso.com Common Test June 2019 Grade 10 1.4 Study the diagram of the human heart shown below and then answer the questions based on it. 1.4.1 1.4.2 1.4.3 1.4.4 1.45 Copyright reserved Name the parts labelled B and E on the diagram above. What type of blood moves in the direction shown by the arrow from B to A? Part D pumps blood to the rest of the body through the part labelled C. Describe one adaptation of part D that allows it to perform this function. Name the organ that receives blood from part labelled A. What name is given to the membrane surrounding the heart? Please turn over (9)

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Life Sciences Downloaded from hlayiso.com Common Test June 2019 Grade 10 SECTION B QUESTION 2 2.1 The diagram below shows a type of cell. 211 Is the above cell an animal cell or a plant cell? Give THREE reasons for answer. 2.1.2 identify organelles labelled X and Z. 2.1.3 Explain TWO functions of the structure labelled X. 2.1.4 Mention TWO functions of the cell membrane in all living cells. Copyright reserved Please turn over

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Downloaded from hlayiso.com Life Sciences Common Test June 2019 Grade 10 2.3 The diagram below shows a cell during a phase in mitosis. 2.3.1 Identify the phase of mitosis shown on the diagram above? (1) Z2o2 Give ONE observable reason for your answer to QUESTION 2.3.1 above. (2) 2.3.3 Give names of the parts labelled A, B and C on the diagram above. (3) 2.3.4 Name and describe the phase that occurs before the phase shown above. (3) 2.3.5 How many chromosomes were there in this cell at the beginning of mitosis? (2) 2.3.6 Give TWO ways in which mitosis is of biological importance in animals. (2) (12) 24 At times cells may continue to divide by mitosis uncontrollably. Such cells are referred to as being cancerous. 2.4.1 Name any two causes of cancer. (2) 2.4.2 In what two ways can cancer be treated? (2) (4) [40] Copyright reserved Please turn over

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Downloaded from hlayiso.com Life Sciences 14 Common Test June 2019 Grade 10 ee A study was carried out to find out the relationship between the age of a person and the gradual loss of calcium from the bones (osteoporosis) which causes them to break easily. The study was done on a group of 20 men from the age of 30 to 80 years. Their bone densities were recorded as shown on the table below: Age of the men(years) Incidence of osteoporosis (arbitrary units) 30 15 40 18 50 27 60 40 70 60 80 90 3.2.1 Which two long bones found between the phalanges and the humerus on the human arm would need a lot of calcium? (2) 3.2.2 Give a reason for your answer to QUESTION 3.2.1 above. (2) 3.2.3 Use the information provided on the table to draw a line graph to represent the results of the investigation. (6) 3.2.4 From the graph that you have drawn, state the relationship between the age of the men and the incidence of osteoporosis. (2) (12) Copyright reserved Please turn over

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Downloaded from hl ayiso.com Life Sciences 16 Common Test June 2019 Grade 10 3.4 The diagram below shows a section through a young root. 3.4.1 3.4.2 3.4.3 3.4.4 Copyright reserved Is the diagram above that of a cross section or a longitudinal section of a root? Name the parts labelled A and B. Describe two structural adaptations of a root hair cell for its function. In which root tissue is a root hair cell found? TOTAL SECTION B: Please turn over

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