Pearson Edexcel International GCSE (9–1) . Biology UNIT: 4BI1 Science (Double Award) 4SD0 PAPER: 1B. 100% proven passing rate. graded A+

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Answer ALL questions. 1 The table lists values that can be obtained in practical investigations. (a) Complete the table by naming pieces of laboratory apparatus that can be used to help obtain thes... e values. The first one has been done for you. (4) Value Apparatus magnification of a red blood cell microscope heat produced by germinating seeds surface area to volume ratio of a potato cylinder breathing rate of a human volume of gas produced by yeast in anaerobic respiration http://britishstudentroom.wordpress.com/*P66428A0332* Turn over 3 (b) The diagram shows a red blood cell viewed through a microscope. (Source: © Artem_Graf/Shutterstock) The actual width of this red blood cell is 8 µm. The magnification of this red blood cell can be calculated using this formula. magnification = width of cell in drawing actual width of cell Calculate the magnification of this red blood cell. (2) magnification = .............................................................. (Total for Question 1 = 6 marks) http://britishstudentroom.wordpress.com/4 *P66428A0432* 2 The diagram shows the human heart with four blood vessels labelled A, B, C and D. A B C D (a) (i) Which blood vessel brings oxygenated blood to the heart? (1) A B C D (ii) Which blood vessel contains blood at the highest pressure? (1) A B C D (b) (i) Draw a label line on the diagram to show the position of a semi‑lunar valve. (1) http://britishstudentroom.wordpress.com/*P66428A0532* Turn over 5 (ii) Describe the function of the semi‑lunar valves. 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(c) In the heart of a foetus, the two upper chambers (atria) are linked by a hole so that blood can pass between them. (i) Explain why this hole is normally closed before the baby is born. 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(ii) Sometimes the hole does not close. Explain what effect this will have on the baby. 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(Total for Question 2 = 10 marks) http://britishstudentroom.wordpress.com/6 *P66428A0632* BLANK PAGE http://britishstudentroom.wordpress.com/*P66428A0732* Turn over 7 3 A student investigates factors that affect photosynthesis. (a) In his first experiment, the student uses this method to investigate the effect of light on photosynthesis. • place a plant in the dark for 24 hours • cover part of leaf X with black paper • place the plant in the light for 24 hours The diagram shows the plant in the ligh [Show More]

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