Life Sciences Grade 11 March Test 2016 Paper & Memo

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Lite sciences DOWnloaded from hlayiSO.COMArch 2016 common Test iC 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

| Lite sciences Downloaded from hlayiso.com SECTION A QUESTION 1 larch 2016 Common Test NSC 3 1.1 Various possible options are provided as 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 Platyhelminthes are called acoelomate because they ... UO DP only have one external opening. are bilaterally symmetrical. possess a body cavity. have no cavity in the mesoderm between the ectoderm and the endoderm. 1.1.2 All viruses are ... oOo WwW > cells with cytoplasm and organelles. unicellular and pathogenic. cellular in structure. acellular and non-living. 4.1.3. Which ONE of the following describes bacteria? A B Cc D Unicellular plants that are parasitic Unicellular, prokaryotic organisms that multiply rapidly Microscopic plants with a saprophytic mode of nutrition Unicellular, prokaryotic organisms that are parasitic 1.1.4 Vaccinations can control the spread of ... A B Cc D genetic disorders. infectious diseases. nutritional deficiencies. viral diseases only. Please turn over

NSC 4 Life Sciences Down loaded from h layiso. COWAch 2016 Comrion Test 1.1.5 Study the plant groups listed below: {i) Bryophytes (il) Pteridophytes (ii) =Gymnosperms (iv) Angiosperms In which of the following do male gametes depend on water or moisture to swim toward the ovum? A (i) and (if) only B (ii) only Cc (only ( D (iii) and (iv) only {5 x 2) = (10) Total Section A= (10) Copyright Reserved Please turn over

Downloaded from hlayiso. CO), 2016 common Test NSC 5 Life Sciences SECTION B QUESTION 2 2.1 Grade 11 learners investigated the effect of three different antibiotics (AB1, AB2 and AB3) on the growth of three different strains of disease-causing bacteria (X, Y and Z). The following procedure was followed. ¢ Nine identical agar plates (petri dishes with the nutrient agar) were prepared. ¢ Bacteria X was cultured on the first three agar plates, bacteria Y on the next three agar plates and bacteria Z on the last three agar plates, « The same amount of AB1 was placed in the centre of each of three agar plates, one with bacteria X, one with bacteria Y and one with bacteria Z. e This step was repeated using AB2 and then AB3. ¢ The nine petri dishes were incubated at the same temperature and at the same time. ¢ Bacterial growth was examined for each agar plate and the diameter of the area where no bacteria grew was measured. The following results were obtained from the investigation. Diameter (mm) of area where no bacteria grew AB1 AB2 AB3 Bacteria X 8 14 3 Bacteria Y 9 11 5 Bacteria Z 6 5 4 2.1.1 Identify the following in the investigation: (a) The independent variable (1) (b) The dependent variable (1) 2.1.2 State the aim for this investigation. (2) 2.1.3 2.1.4 Which antibiotic was the most effective in decreasing bacterial growth? (1) Which TWO variables did the learners keep constant to ensure the validity of their investigation? (2) 2.1.5 State TWO ways in which learners could improve the reliability of this investigation. Copyright Reserved (2) (9) Please turn over

Lite sciences DOWNloaded from hlayisSO.COMMs 2016 common Test NSC 6 2.2 Diagram A shows a complete animal while diagram B shows cross section through the body of the same animal. ff Diagram B Diagram A 2.2.1 Identify the phylum to which this organism belongs. 2.2.2 What type of gut does this organism have? 2.2.3 Explain ONE disadvantage of the type of gut named in Question 2.2.2. 2.2.4 Explain ONE importance of the development of a coelom. Copyright Reserved Please turn over (1) (2) (2) (6) [15]

| Lite sciences 9 Downloaded from hlayisO.CQ@i sis common tex NSC 7 i QUESTION 3 | 3.1. The diagram below represents a phylogenetic tree of different groups of animals. | Study the diagram and answer questions that follow. Porifera Platyhelminthes Mollusca Arthronoda Chordata “Cnidaria Nematoda Annelida Echinodermata Segmegtation No body cavity ae Bilateral symmetry ‘True tissue Ancestral protists 3.1.1 From the above phylogenetic tree, which group represents the ancestor of the animal kingdom? (1) 3.1.2 How many animal phyla are shown on this tree? (1) i 3.1.3 The first major split in the animal kingdom was into radial and bilateral so ) symmetry. (a) — Which phylum did not form a part of this split? (1) (b) — Which phylum has radial symmetry? (1) 3.1.4 The second split in the animal kingdom was based on the presence and absence of a true coelom. (a) Name the phylum that does not have a true coelom. (1) (b) | State ONE way in which the coelom of annelids and arthropods are different from each other. (2) 3.1.5 From the diagram, identify ONE phylum you have studied which: (a) Is diploblastic (1) (b) | Has a coelom and is bilateral symmetrical (1) Copyright Reserved Please turn over

Life Sciences 3.2 Copyright Reserved The graph below shows changes in the concentration of antibodies during two Downloaded from hlayiSO.COmMen 2016 common Test NSC 8 exposures to an antigen (a substance that stimulates the production of an antibody when introduced into the body) over time. Second exposure 104 L to antigen « First exposure 2 103 - to antigen 5 opel 9 2 102 IL 8 5 >P 22 w <~ 499 } ; ; 0 7 14 21 28 35 42 49 Time (days) 3.2.1 Which type of immunity (passive or active) is represented by the graph? (1) 3.2.2 3.2.3 3.2.4 Name the substance produced by the body that destroys harmful bacteria. (1) Describe ONE difference in the response to the first exposure and the second exposure to the antigen. After how many weeks did the antibody concentration reach 104 arbitrary units? (2) (2) (6) [15] Total Section B= 30 Ci Please turn over

ute sciences Downloaded from hlayisO.CQIMN, seis common test NSC 9 SECTION C QUESTION 4 4.1 Atrend in the evolution of plants has been an increase in the size of plants and a decreasing dependence on water for reproduction. Explain the above trend through a comparison of the bryophytes and the angiosperms. NOTE: No marks will be awarded for answers in the form of tables, flow charts and diagrams. Content : (17) Synthesis: (03) (20) TOTAL MARKS: [60] Copyright Reserved

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