Life Sciences Grade 11 March Test 2018 Paper & Memo

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Life Sciences - Grade 11 Downloaded from hlayiso.com Common Test March 2018 NSC 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

Life Sciences - Grade 11 SECTIONA QUESTION 1 Downloaded from hlayiso.com NSC 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 1.1.6 D. 1.4.1 Copyright reserved number (1.1.1 to 1.1.5) in your ANSWER BOOK, for example Which ONE of the following are branching filaments that make up the mycelium of a fungus? A Cilia B Hyphae C Proteins D Flagella Which ONE of the following organisms acts as a vector in the transmission of malaria? A Plasmodium B Anopheles C Amoeba D Mycobacterium Edward Jenner infected a boy with cowpox (which resembles a mild form of smallpox). When the boy recovered from the cowpox, Jenner infected him with smallpox. No disease developed. This was the discovery of the first successful ... A antibody. B virus. C vaccine. D antibiotic. Lichen is a combination of algae and fungi. The fungi absorb water and make it available to the algae for photosynthesis. Fungi are heterotrophic and obtain their nutrients from the algae. Which ONE of the following represents the relationship described above? A Competition B_ Parasitism C Commensalism D Mutualism Seeds are better suited for survival than spores because they ... A canremain dormant for long periods. B are dispersed by wind only. C have a limited food supply. D are smaller. (5 x 2) TOTAL SECTION A: Common Test March 2018 (2) (10) 10 Please turn over

Life Sciences - Grade 11 Downloaded from hlayiso.com NSC SECTION B QUESTION 2 a4 Cholera is a disease caused by the bacterium Vibrio cholerae. An outbreak of cholera occurred in London in 1849. An investigation was conducted to determine the relationship between the number of deaths from cholera and the height above sea level at which people lived. The results of the investigation, obtained from historical records, are shown in the graph below. 2.1.1 Copyright reserved 100 | 80 Number at deaths per 10.000 from cholera 40, 0 20 40 60 80. 100 120 Height above sea level/m State a hypothesis for the investigation. The population size of London in 1849 was 2,5 million. Use information from the graph to determine the number of deaths from cholera at a height of 10m above sea level. Show all working. Provide TWO possible explanations as to why antibiotics may sometimes prove ineffective in the control of cholera. The last major outbreak of cholera in South Africa occurred in 2004. Of the 738 people who were diagnosed with cholera, a total of four died from the disease. Suggest TWO reasons for a decrease in the number of deaths from cholera over time Common Test March 2018 (2) (10) Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 11 Common Test March 2018 NSC 22 The uterus is a female organ in which offspring develop before birth. The lower end of the uterus is called the cervix. Scientists investigated the link between cervical cancer and infection with some types of Human Papilloma Virus (HPV). The table below shows the frequency of five different types of HPV in women who had cervical cancer. Type of Human | Percentage of women with cervical cancer Papilloma Virus (HPV) who have this type of HPV 7 HPV6 7 7 HPV11 ; 2 HPV16 : 66 - HPV18 16 L_ HPV31 — 8 7 2.2.1 A local newspaper published an article about cervical cancer with the headline “HPV6 is the main cause of cervical cancer”. Does the data in the table support this claim? Explain your answer. (2) 2.2.2 Scientists have developed vaccines against HPV. The vaccines contain HPV antigens. What is an HPV antigen? (1) 2.2.3 Explain why antibiotics will be ineffective against HPV. (2) (5) [15] Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 11 Common Test March 2018 NSC QUESTION 3 3.1 Read the extract below and answer the questions that follow. How a Seed Bank, almost lost in Syria’s War, could help feed a Warming Planet Ali Shehadeh is a plant conservationist from Syria. His goal is to safeguard those seeds that may be hardy enough to feed us in the future, when many parts of the world could become as hot, arid and inhospitable as it is in the Middle East. As the War in Syria intensified Mr Shehadeh was forced to leave the Icarda Seed Bank in Syria and flee his country. However, long before the War, in 2008, Icarda had begun to send seed samples to the Svalbard Global Seed Vault in Norway. This vault is built deep into the side of a mountain, situated above the Arctic Circle. Mr Shehadeh hunts for the genetic traits that will be most useful in the future: resistance to pests and blistering winds and the ability to endure intensely hot summers. He tries to select for these traits and breeds them into the next generation of seeds. 3.1.1 State TWO benefits of seed banks indicated in the extract. (2) 31.2 Explain why seeds originating in the Middle East would be suitable for cultivating in all parts of the world in the future. (2) 3.1.3 State why the location of the Svalbard Global Seed Vault may be regarded as ideal for seed preservation. (1) (5) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 11 Common Test March 2018 NSC 82 Study the phylogenetic tree below showing how four plant groups evolved. & 5 3 g a 7 g E 2 £ 2 8 G naked fruit seeds | | enclosed cones seed flowers pollen motile non sperm non-motile vascular | sperm seedless seed roots, stems, leaves vascular motile gametes i algae 3.2.1. Name the common ancestor of all the plant groups represented. (1) 3.2.2 List TWO characteristics of mosses shown on the phylogenetic tree. (2) 3.2.3 Ferns are dependent on water for fertilization. Provide evidence from the phylogenetic tree to justify this statement. (1) 3.2.4 Angiosperms are the largest and most diverse group of plants. Explain why the presence of flowers has made the angiosperms more successful over the gymnosperms. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 11 Common Test March 2018 NSC 3.3 The electron micrographs below show pollen grains (A and B) from two different plants. A B 3.3.41 Define the term pollination. (2) 313.2 Explain an observable feature of pollen grain A that makes it suited for pollination by animals. (2) (4) [15] TOTAL SECTION B: 30 SECTION C QUESTION 4 Describe the body plans of the phyla Porifera and Platyhelminthes in relation to their respective modes of life. Content: (17) Synthesis: (3) NOTE: NO marks will be awarded for answers in the form of flow charts, tables or diagrams. TOTAL SECTIONC: 20 GRAND TOTAL: _— 60 Copyright reserved I

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Life Sciences - Grade 11 3 Me NSC — Memorandum SECTIONA QUESTION 1 141 111 B vv 12 B Ye i143 ¢ <8 114 D VY £ 5 AY (5x2) fo) TOTAL SECTION A: ro) SECTION B ” QUESTION 2 —_ > 24 2.1.1 As height above sea level/altitude increases the death rate from o cholera increases¥ ¥ OR As height above sea level/altitude increases the death rate from <= cholera decreasesv ¥ = . Height above sea levei/altitude has no effect on the death rate from o choleray ¥ — 2.1.2 _ 60 xe) —— x 2.500 000v o 10 000 xe} = 15 000V © 2.1.3 - Course of antibiotics not completed” {o) - resulting in production of more” bacteria —_ ng - Mutations¥ of bacteria may occur = - making them resistant” to antibiotics fo) - Overuse” of antibiotics - kills antibiotic-sensitive bacteria”, allowing antibiotic-resistant QO bacteria to grow and multiply Any 2x2 (Mark first TWO only) 2.1.4 - Introduction of antibiotics ¥ Improved sanitation” ~ Improved hygienev Any 2 (Mark first TWO only) Copyright reserved Common Test 2018 (10) 10 (2) (2) (4) (2) (10) Please turn over Life Sciences - Grade 1. 4 2.2 2.2.1 2.2.2 2.2.3 QUESTION 3 3.1 3.11 3.12 3.13 32 3.2.1 3.2.2 33 3.3.1 3.3.2 Copyright reserved NSC — Memorandum Nov - A high percentage of women with cervical cancer have HPV16¥ OR Noy - A low percentage of women with cervical cancer have HPV6 Substance/molecule from HPV capable of producing an immune response /antibodies. - Antibiotics are only effective in destroying livingY organisms - Viruses, like HPV, do not have the general character s of living organisms ¥ - Ensure food security” - Preservation of seeds that are resistant to pests” ~ Preservation of seeds that are resistant to harsh weather conditions /heav/droughw wind Any 2 (Mark first TWO only) - These seeds are adapted for survival in hot, dry conditions” that may occur in all parts of the world in the future - due to climate change/global warmingY¥ Cool” conditions (in Arctic/polar region) Secure” location (deep inside mountain) Any | (Mark first ONE only) Algaev - Non-vascularY - Motile gametes~ Motile sperm¥ - Flowers have a larger variety of pollinating agents” - increasing their chances” of pollination/fertilization/reproduction - Transfer of pollen” - from an anther to a stigmav - Rough/spiky edges¥ - to attach” to body covering of animal Total Section B: March Common Test 2018 (2) a) (2) (5) [15] (2) (2) (1) (5) (4) (2) (6) (2) (2) (4) (15) 30 Please turn over

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