Pearson Edexcel Level 3 GCE Biology B Advanced PAPER 3: General and Practical Principles in Biology. question booklet mark scheme results November 2021

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pearson-edexcel-gce-question-booklet-mark-scheme-results-november-2021-in-biology-9bi0-03-paper-3-general-and-practical-principles-in-biology Answer ALL questions. Write your answers in the spaces p ... rovided. 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. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) State why stains, such as methylene blue, are sometimes used when preparing a microscope slide. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 1 = 6 marks)4 *P67805A0436* 2 (a) Compare and contrast the central nervous system and the peripheral nervous system. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................................................... [Show More]

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