NAME ___________________________________________________________________
COBBE BARRACKS CDSS SCORE
2020 MSCE MOCK EXAMINATION
BIOLOGY PI
(100 marks)
INSTRUCTIONS: Question Marks
Number Scored
1. Write your real name in full and your class at the top of each page. 1
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2. This paper contains 8 printed pages, please check.
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3. This paper has two sections, A and B. 4
4. Answer all the questions in this paper in the spaces provided. 5
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5. Read each question carefully and organise your response before writing
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it down.
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6. Write down your answers neatly using your best legible handwriting. 9
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TOTAL
MARKS
Section A (70 Marks)
1. a. Give one example of each of the following groups of animals:
(i) molluscs (1 mark)
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(ii) crustaceans (1 mark)
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b. Explain one way how the body shape of a fish assists in locomotion (2 marks)
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2. Table 1 shows results of an investigation in which six test tubes containing equal amounts of
starch and amylase solutions were incubated at different temperatures. Use it to answer the
questions that follow.
Test tube 1 2 3 4 5 6
Temperature (oC) 15 25 35 45 55 65
Time taken for reaction to 135 75 30 15 95 185
complete (seconds)
a. (i) State the aim of the investigation (1 mark)
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(ii) Give the optimum temperature for the reaction (1 mark)
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(iii) Explain why the rate of reaction is slowest in test tube 6 (2 marks)
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b. Name two glands which produce amylase in the human body (2 marks)
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c. Explain how enzyme concentration affects enzyme activity (3 marks)
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3. a. Name the tropic response to each of the following stimuli:
(i) gravity (1 mark)
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(ii) moisture (1 mark)
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b. Mention two examples of nastic responses (2 marks)
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c. State two differences between tropisms and nastic responses (2 marks)
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4. a. Name the body protein which a person with albinism does not produce (1 mark)
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b. Give two traits other than sex traits which are controlled by genes located on the
X-chromosome (2 marks)
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c. What type of genetic dominance is shown by an individual with sickle cell trait? (1 mark)
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d. Describe one way in which mutations are important in living organisms (2 marks)
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5. a. Name two organelles in which cellular respiration occurs (2 marks)
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b. State two ways how aerobic respiration is different from anaerobic respiration (2 marks)
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c. Explain one way how the trachea is adapted to its function (2 marks)
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6. a. State any one function of reflex actions (1 mark)
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b. What type of neurones is wholly located in the grey matter of the spinal cord? (2 marks)
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c. State two factors which affect the speed of nerve impulses through a neurone (2 marks)
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d. Explain one way how nervous coordination differs from endocrine coordination (2 marks)
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7. a. Give two ways how transpiration is important (2 marks)
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b. Explain how light intensity affects the rate of transpiration (2 marks)
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c. Explain one possible cause of the transpiration stream (3 marks)
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8. a. Mention one reproductive process which occurs in the oviduct (1 mark)
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b. State two advantages of breastfeeding (2 marks)
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c. Explain one adaptation of the placenta to its function (2 marks)
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d. State one way for preventing obstetric fistula (1 mark)
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9. a. Name two groups of microorganisms which are commonly used in biotechnology
(2 marks)
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b. Define ‘plasmid’ (1 mark)
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c. Give the function of ‘restriction enzymes’ (1 mark)
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d. Name two medical products which are produced through genetic engineering (2 marks)
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10. a. State any two natural causes of climate change (2 marks)
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b. Explain any two impacts of climate change on living organisms (4 marks)
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c. State two natural processes which release carbon dioxide into the atmosphere (2 marks)
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11. a. Define ‘evolution’ (1 mark)
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b. Name two examples of vestigial structures in animals (2 marks)
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c. Explain how comparative anatomy supports the theory of evolution (2 marks)
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Section B: Essay Questions (30 Marks)
12. Describe any five characteristics of living things. Your answer must be in essay form
(10 marks)
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13. Describe the process of mitosis. Write your answer in essay form (10 marks)
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14. Explain the function of any five hormones in the human body. Give your answer in essay
form (10 marks)
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END OF QUESTION PAPER
