香港CE会考 生物科目 英文版 模拟卷.docx

1、香港CE会考 生物科目 英文版 模拟卷Sheng Kung Hui Tang Shiu Kin Secondary SchoolFirst Term ExaminationBiologyTime allowed: 2 hoursF. 4 December 2007Name: _Class: _ ( )Instructions: Answer ALL questions. Section A: Structured Questions (90 Marks) Section B: Multiple Choice (30 Marks) The diagrams in this paper are N

2、OT necessarily drawn to scale. Total: 120 Marks Section A: Structured Questions (90 marks)1. The diagram below shows how an amoeba keeps the water potential of the body fluid constant. When water is in excess, a contractile vacuole would form within its body with the expenditure of energy. (13 marks

3、)In an experiment, an Amoeba was placed in different concentrations of saltwater. The number of contractile vacuoles discharged in an hour were counted and recorded as shown in the table below: Concentration of saltwater (%) Number of contractile vacuole discharged per hour per Amoeba00.050.100.150.

4、200.250.30100908070603520 (a) Plot a graph to show the above result. (3) (b) Explain why the discharge of contractile vacuole is necessary at all concentrations of saltwater shown above. (5) (c) Describe and explain the changes in number of contractile vacuoles discharged from 0 to 0.30 % concentrat

5、ion of saltwater. (2) (d) What will happen to Amoeba if during the experiment, a small amount of respiratory poison (e.g. cyanide) is added to 0.05 % saltwater? (3)2. An experiment was carried out to demonstrate anaerobic respiration in yeast as shown below: (12 marks) (a) What is the initial volume

6、 of the mixture in the measuring cylinders? (1) (b) What is the volume of the mixture after one hour in containers A and B respectively? (1) (c) What product of anaerobic respiration has caused the swelling of the dough? (1) (d) Suggest one reason for the difference in the volume of the dough after

7、one hour. (2) (e) Which food material in the dough provides the raw material for anaerobic respiration? (1) (f) The diagram below shows the temperatures of two samples of dough kept in insulated boxes for 2 hours. Initially, they were at the same temperature. (i) What is the temperature shown on the

8、 thermometer in X and Y respectively? (1) (ii) Suggest one reason for the difference in temperatures shown by the two thermometers. (2) (g) (i) To which kingdom of organisms does bakers yeast belong? (1)(ii) Suggest one way to slow down the rising of the dough. Explain your answer. (2) 3. Two differ

9、ent types of cells were observed under a microscope. The cells were then drawn as shown below. (15 marks) (a) Name and state ONE function for each of the structures labeled 1, 4 and 6. (6) (b) (i) What structure appears in part 9 during cell division? (1) (ii) Give TWO facts about these structures.

10、(2) (c) (i) Give TWO reasons why cell A is a plant cell. (2) (ii) Suggest ONE reason why cell A was taken from a green leaf. (1) (d) A scale is provided with each drawing. Use these scales to find out the actual sizes of (i) the diameter of the structure labeled 9. (1) (ii) the diameter of cell A be

11、tween points X and Y (Show your working steps). (2)4. A teacher has prepared a key for identifying seven types of organisms: (7 marks)(a) Name groups A to E. (5)(b) The following diagram shows an unknown green specimen: Using the above key, identify the specimen. List the steps you used in finding o

12、ut your answer. (2) 5. The diagram below shows a transverse section of part of a green leaf. (14 marks) (a) Name parts A, D and F. (3) (b) State the functions of Part A and Part C. (2) (c) State FOUR features shown in the diagram that facilitate the leaf to carry out photosynthesis. (4) (d) Which fo

13、rm of carbohydrate is (i) made by cell D immediately after photosynthesis? (ii) stored inside cell D after photosynthesis? (iii) transported away from the leaf? (3) (e) Which structure, not shown in the diagram, is responsible for (i) the transport of water to cell D? (ii) the transport of carbohydr

14、ate to other parts of the plant? (2)6. A student has performed an investigation to show the need of some factors for photosynthesis. The following diagram shows his set up: (17 marks) After exposing the set-up under sunlight for 3 hours, the student detached the leaf and tested it for the presence o

15、f starch. (a) What should be done to the plant before carrying out the experiment? Why is this step important? (2) (b) What is the use of potassium hydroxide solution in the glass jar? (1) (c) Describe the procedure for the test of starch. (4) (d) State the colours of the four labeled regions after

16、the iodine test. (4) (e) What conclusion can be drawn by comparing (i) regions P and Q? (1) (ii) regions Q and S? (1) (iii) regions Q and R? (1) (f) Region Q can be used to show the need of light for photosynthesis. Which part of the leaf should we choose as the control? (1) 7. In an experiment to s

17、tudy the effect of temperature on the action of an enzyme for coagulating milk, milk and the enzyme were first kept in separate test tubes in a water bath at ToC for 15 minutes before they were mixed. The resulting mixture was kept in the same water bath. The time taken for milk to coagulate was not

18、ed and the experiment was repeated by using water baths at different temperatures. The time taken for the milk to coagulate at different temperatures is shown in the table below. (9 marks)Temperature of water bath (ToC)Time taken for coagulation (minutes)10No coagulation occurred.20730440250460No co

19、agulation occurred. (a) What is the purpose of keeping the milk and enzyme in the water bath for 15 minutes before mixing? (1) (b) At which temperature was the enzyme most active? (1) (c) State and explain whether there would be any change in the results if the mixture originally kept at 10oC was wa

20、rmed to 30oC. (3) (d) What control experiment should be carried out to confirm that the coagulation of milk was due to the action of an enzyme? What was the expected result? (3) (e) State one factor, other than temperature, that can affect the activity of enzymes. (1) Section B: Multiple Choice (30

21、marks)1. Cells that have a higher level of activity have moreA. nucleus.B. cytoplasm.C. mitochondria.D. vacuoles.2. When preparing a temporary slide of a specimen for microscopic observation, what are the purposes of using a cover-slip to cover the specimen?(1) To provide a flat surface for vision.(

22、2) To allow more light to pass through the specimen.(3) To reduce the water loss from the specimen.A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)3. The diagram below shows two objectives of a microscope. If 150 yeast cells can be seen under the lower power objective, ho

23、w many yeast cells can be seen under the high power objective? A. 50 B. 120 C. 150 D. 4504. What is anabolism? A. It refers to all the chemical reactions that take place within an organism. B. It refers to all the slowing-down reactions that take place within an organism. C. It refers to all the bui

24、lding-up reactions that take place within an organism. D. It refers to all the breaking-down reactions that take place within an organism.5. Which of the following statements about a microscope is correct? A. The first microscope invented was an electron microscope. B. A compound microscope includes

25、 the use of one lens only. C. A light microscope can only give two-dimensional images. D. A light microscope is generally more powerful than an electron microscope in terms of magnification power.6. Which of the following is true about active transport in our body? A. It is the fastest way of absorb

26、ing materials. B. It does not require energy.C. It allows the greatest amount of materials to be absorbed when compared with diffusion and osmosis.D. It helps the absorption of essential materials against a concentration gradient.7. When a plant cell is placed in a hypertonic solution, what will hap

27、pen eventually? A. The cell will burst. B. the cell will be plasmolysed. C. The cell will shrink. D. The cell will become turgid.Directions: Questions 8 to 9 refer to the set-up below, which is used to demonstrate osmosis.8. Which graph shows the changes of liquid level in the glass tube?9. If gluco

28、se is used instead of sucrose, the liquid level rises and eventually returns to the first liquid level. This is because A. glucose has more energy than sucrose. B. glucose is small enough to pass through the tubing but sucrose is not. C. glucose is more soluble than sucrose. D. glucose can affect th

29、e water potential more significantly than sucrose.10. The rate of diffusion can be increased by (1) increasing the temperature. (2) increasing the surface area over which diffusion occurs. (3) decreasing the concentration gradient between the two regions. (4) using a selectively permeable membrane.

30、A. (1) and (2) only B. (1) and (4) only C. (2) and (3) only D. (1), (2) and (4) onlyDirections: Questions 1113 refer to the diagram below which shows an apparatus to investigate the respiration of germinating seeds.11. After two hours the coloured liquid in the U-tube rose up in the right arm. Which of the following is the most suitable solution to be put in tu