Pearson Edexcel Level 3 GCE. Biology B Advanced PAPER 3: General and Practical Principles in Biology

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Write your answers in the spaces provided. 1 Plant stems contain xylem and phloem, tissues specialised for transport. The photomicrograph shows a longitudinal section of phloem tissue. ...  X (a) (i) Draw the cell labelled X. (2)*P67805A0336* Turn over 3 (ii) Explain how phloem tissue is adapted for its function. 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(b) State why stains, such as methylene blue, are sometimes used when preparing a microscope slide. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 1 = 6 marks) 2 (a) Compare and contrast the central nervous system and the peripheral nervous system. 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(b) During the First World War, some soldiers received head wounds that damaged one side of the cerebellum. One soldier said ‘The movements of my left hand are done subconsciously but I have to think out each movement of my right arm.’ (i) State one function of the cerebellum. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) State the part of the brain the soldier used to think about moving his right arm. (1 [Show More]

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