Pearson Edexcel International GCSE (9–1) Human Biology UNIT: 4HB1 PAPER: 02. Question paper. Latest, Predictor questions

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Answer ALL questions. 1 (a) The photograph shows a group of red blood cells. (Source: RomanenkoAlexey/Shutterstock) (i) Describe the function of red blood cells. (3) ................................ ....................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Explain how the structure of the red blood cell is adapted to its function. (4) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... https://britishstudentroom-b430a.web.app/4 *P67062RA0428* (b) The photograph shows a section through a blood vessel in a leg. A B magnification ×10 (Source: © DR. GLADDEN WILLIS, VISUALS UNLIMITED/SCIENCE PHOTO LIBRARY) (i) State the type of blood vessel shown in the photograph. (1) .................................................................................................................................................................................................................................................................................... (ii) Explain your choice of blood vessel. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... https://britishstudentroom-b430a.web.app/*P67062RA0528* Turn over 5 (iii) Calculate the actual distance between points A and B. (2) distance = .............................................................. mm (Total for Question 1 = 12 marks) https://britishstudentroom-b430a.web.app/6 *P67062RA0628* 2 A student uses these three tests to identify the contents of four powders, W, X, Y and Z. • iodine test • Benedict’s test • biuret test The table shows the student’s results. Colour observed after testing Test Powder W Powder X Powder Y Powder Z iodine yellow / brown black black yellow / brown Benedict’s blue brick red blue brick red biuret purple blue blue purple (a) Describe how the student should safely carry out the Benedict’s test on the powders. (4) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... [Show More]

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