NATIONAL ASSESSMENT AT FORM III
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1 MINISTRY OF EDUCATION AND 1 HUMAN RESOURCES, TERTIARY EDUCATION AND SCIENTIFIC RESEARCH MAURITIUS EXAMINATIONS SYNDICATE NATIONAL ASSESSMENT AT FORM III NAME SCHOOL NAME CLASS/SECTION BIOLOGY October hour Students answer on the Question Paper. READ THESE INSTRUCTIONS FIRST Write your name, the name of your school and your class/section in the spaces provided above. Write in dark blue or black ink. Any rough working should be done in this booklet. Do not use correction fluid. There are 8 questions in this paper. Check that this document consists of 10 printed pages and 2 blank pages. Any discrepancy in the document must be immediately notified to the responsible officer in your school. Answer all questions. All answers must be written in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. The total of the marks for this paper is 50.
2 2 Question 1 Multiple Choice Questions (5 marks) For each item, there is one correct answer. Draw a circle around the letter which indicates the correct answer. (a) Which one of the following is absent in cells of plant roots? A Cytoplasm B Chloroplast C Nucleus D Cell wall (b) Two ways by which molecules move in and out of cells are diffusion and osmosis. Which of the following is not involved in osmosis? A Cell wall only B Cell membrane only C Both cell wall and cell membrane D None of the above (c) Fig. 1 shows horizontal sections through a stem and a root. Identify the regions which transport sugars. stem root Fig. 1 A 2 and 3 B 1 and 3 C 2 and 4 D 1 and 4 (d) Which one of the following best describes the structure of the capillary? Size of Lumen Wall Valves A Small Thick, Elastic Absent B Large Thin, Elastic Present C Large Thick, Non-elastic Present D Small Thin, Non-elastic Absent
3 3 (e) Which route is taken by air as it passes into the lungs of a mammal? A Trachea alveolus bronchiole bronchus B Alveolus trachea bronchus bronchiole C Bronchus trachea bronchiole alveolus D Trachea bronchus bronchiole alveolus Question 2 (6 marks) Fig. 2 shows a vertical section through the heart A B Fig. 2 (a) On Fig. 2, four blood vessels are numbered 1 to 4. (i) Draw a circle around one of the numbers that shows an artery. [1] (ii) Place a tick ( ) on one blood vessel carrying deoxygenated blood. [1] (iii) Draw an arrow ( ) to show the direction of blood flowing along blood vessel marked 4. [1] (b) (i) Name the chamber marked A. A:... [1] (ii) Name structure B. B: [1] Please turn over this page
4 4 (c) Why is structure B important in the heart? [1] Question 3 (6 marks) blood vessel C Fig. 3 D (a) (i) Identify the two types of blood cells labelled C and D in Fig. 3. C:.. [1] D:.. [1] (ii) State the function of each cell. C:. [1] D:. [1] (b) Suggest two ways by which cardiovascular diseases such as high blood pressure and heart attack can be avoided [1] [1]
5 5 Question 4 (5 marks) Fig. 4 shows two microscopic cells, A and B. (10 µm = 0.01 mm) A B Fig. 4 (a) (i) Identify cell B. B:. [1] (ii) State its function.... [1] (iii) Name the organ that manufactures cell B.. [1] (iv) Name the structures present in the nucleus which control production of proteins.. [1] (b) Syphilis and AIDS are sexually transmitted diseases. Give one reason why Syphilis can be treated with antibiotics but not AIDS.. [1] Please turn over this page
6 6 Question 5 (5 marks) Fig. 5 shows three cells p, q and r after they have been placed in different solutions G, H and I. p q r cell in solution G cell in solution H cell in solution I Fig. 5 (a) Which cell has been placed (i) in distilled water?.. [1] (ii) in a concentrated salt solution?.. [1] (b) Describe what has happened to cell r when left in solution I [2] (c) In cell r, place the letter N to show the position where the nucleus could then be found. [1]
7 7 Question 6 (5 marks) (a) (i) What do you understand by the term biodiversity? [1] (ii) Give 2 reasons why it is very important to maintain biodiversity [1] [1] (iii) Suggest one way by which humans can threaten (harm) biodiversity [1] (b) Suggest one way how you can improve the environment where you live [1] Please turn over this page
8 8 Question 7 (11 marks) Fig. 6 shows a student carrying out an experiment on breathing. jar air water Fig. 6 support for jar (a) State 3 ways in which the air in the jar will differ from atmospheric air. (i)... [1] (ii)... [1] (iii)... [1] (b) Table 1 shows changes in breathing in an athlete at rest and under heavy exercise. % oxygen in inhaled air % oxygen in exhaled air Number of breaths per minute At rest During exercise Table 1 From the information given above, suggest why these changes have occurred during exercise. (i) Changes in % oxygen in exhaled air:..... [2] (ii) Changes in number of breaths:..... [2]
9 9 (c) Give two differences between breathing and respiration. (i)..... [1] (ii).... [1] (d) Name 2 respiratory diseases caused by smoking cigarettes [1] 2... [1] Question 8 (7 marks) (a) Define communicable infectious disease... [2] Read the passage below and answer the question that follows. History of Zika Zika virus was first discovered in 1947 and named after the Zika forest in Uganda. In 1952, the first human cases were detected. Since then, outbreaks of Zika have been reported in tropical Africa, Southern Asia and the Pacific Islands. Zika virus is transmitted to people primarily through the bite of an infected Aedes species mosquito, the same that spread Dengue and Chikungunya viruses. Zika virus can be transmitted during sexual intercourse even if the infected person does not show any symptoms at that time. Thus, a pregnant woman, who has been infected with the Zika virus, can pass the virus to her foetus during her pregnancy where severe reduction in brain size has been noted. It has been noted that the virus can remain a longer time in semen than in other body fluids. To date, there are no reports that infants could get the virus through breastfeeding. For this reason and due to the benefits of breastfeeding, mothers are encouraged to breastfeed even in areas where the virus is found. No vaccine exists yet to prevent Zika. Please turn over this page
10 10 (b) Suggest and explain two methods by which the control of Zika can be successful [1] [1] (c) Fig. 7 shows the number of HIV (AIDS) cases recorded in a European country from 1983 to Number of cases Year of diagnosis Fig. 7 (i) Calculate the percentage decrease in HIV cases from 1993 to1997. Show your working. Answer:. [1] (ii) Suggest 2 reasons for the decrease in HIV cases during that period [1] [1]
11 11 BLANK PAGE Please turn over this page
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