Life Sciences Grade 11 September Test 2015 Paper & Memo

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Downloaded from hlayiso.com Life Sciences Common Test September 2015 2 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 answer 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. 8. Draw diagrams, flow charts or tables only when asked to do so. 9. The diagrams in this question paper are NOT necessarily drawn to scale. 10, Do NOT use graph paper. 41. You must use a non-programmable calculator, protractor and a compass where necessary. 12. Write neatly and legibly. Copyright Reserved Please Turn Over

Life Sciences SECTION A QUESTION 1 Downloaded from hlayiso.com NSC 3 Common Test September 2015 1.1. Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A ~ D) next to the question number (1.1.1 ~ 1.1.5) in the answer book, for example 1.1.6 D. 1.1.1. Which ONE of the following statements is TRUE about the relationship between a predator and its prey? A B c D There is interspecific competition The size of the predator population is density dependent and is controlled by the prey population An increased number of predators lead to an increased number of prey A decreased number of predators lead to a decreased number of prey immigration does not occur ... A B c D food supply must be increased. predators must be removed. i) 1.1.2 In order to maintain a stable population in an area where emigration and the mortality rate must be lower than the natality rate. the mortality rate must be equal to the natality rate. 1.1.3 During inhalation and exhalation, friction is reduced by fluid between the ... A pleural membranes. B. alveoli and pleura. Cc lungs and thoracic cavity. D pleura and ribs. 1.1.4 The sequence of processes responsible for the composition and volume of () urine produced is ... A. reabsorption, excretion and filtration. B. excretion, filtration and reabsorption. Cc. excretion, reabsorption and filtration. D. filtration, reabsorption and excretion. 1.1.5 The social organisation that enhances the survival of a species is ... A. B. Cc, D. Copyright Reserved external fertilisation. symbiosis between members of a species. division of labour among members of a colony. hunting individually. ” (5x 2=10) TOTAL SECTION A: [10] Please Turn Over

Downloaded from hlayiso.com Life Sciences NSC Common Test September 2015 4 SECTION B QUESTION 2 2.1 The following diagrams are based on the breathing mechanism and gaseous exchange in the human body. The arrows represent the movement of air/gases. Breathing mechanism and gaseous exchange in the human body 2.1.1 Identify the phase in the breathing mechanism represented by A. (1) ( f 2.1.2 Describe the changes that occur in the body to bring about the process represented by B. (5) - 2.1.3 State TWO ways in which CO, is transported after it moves in the direction indicated Y. (2) (8) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences NSC 5 2.2 The following graph indicates the effect of smoking and diseases on mortality. The effect of smoking and disease on mortality 240-, 220 200-4 180-- 160— 440 4120. 100. 30— 60-—] 40—| 20... Mortality rate per 100 000 2 4 Diseases never smoke Key Ce 4, Lung Cancer 4. Respiratory diseases ‘ okers 2. Mouth and larynx 5. Heart diseases @ active sm 3. Other cancers 6. Other medical conditions [& passive smokers 2.2.1 Identify ONE: (a) Independent variable (o) Dependent variable 2.2.2 State how many active smokers per 100 000 die of heart diseases. 2.2.3 Indicate the ratio between active smokers and non-smokers that die of respiratory disorders. 2.2.4 State TWO ways in which the validity of this investigation can be ensured. Common Test September 2015 (1) (1) (1) (2) (2) (7) [15] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences , NSC Common Test September 2015 6 QUESTION 3 3.1. A researcher wanted to know how many fish were in a dam. He caught 20 fish and marked them by clipping out a small section of their tail fins. He then released them back into the dam. A few days later he caught 25 fish and found that 8 had been marked, He then used the following formula: P=ExS M P= Estimated total number of fish in the population F= Number of fish caught and marked in the first catch S= Number of fish caught in the second catch M= Number of marked fish in the second catch () 3.1.1 Estimate the total number of fish in the dam by using the above formula. ° Show ALL working (3) 3.1.2 Explain ONE way in which the method used by the researcher to mark the fish could have resulted in an inaccurate estimate of the fish population in the dam. (2) 3.1.3 Explain ONE way in which the researcher could have increased the reliability of his estimate of the fish population in the dam. (2) (7) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences NSC Common Test September 2015 7 3.2. Graph Ais a representation of the number of bacteria in a growth culture, over a period of time. Graph B shows changes in the human population size over a period of time. oncnanasans en eens A, Growth of a bacterial population ina testtube —_B. Growth of the human population 1 aaa A z be eriod B £ a im S q EA o o a Period A a i = o Time (Hours) Time (Years) 3.2.1 During which period (A or B) did natality exceed mortality? (1) 3.2.2 According to the graphs, in what way is the growth of the human population similar to that of the bacterial population? (2) 3.2.3. Explain why it may take the human population longer to reach the type of growth shown by the bacteria population in Period B. (3) 3.2.4 State TWO measures which can be implemented in South Africa to oy slow down the growth in the population. (2) ! (8) [15] TOTAL SECTION B: [30] SECTION CG QUESTION 4 If the water level in the renal artery is below normal, describe the functioning of the different parts of the nephron in raising the water level back to normal. Content: (17) Synthesis: (3) NOTE: No marks will be awarded for answers in the form of flow charts, tables or diagrams. TOTAL SECTION C: [20] GRAND TOTAL: [60] Copyright Reserved

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