Pearson Edexcel GCE (Biology B Advanced Subsidiary PAPER 2: Core Physiology and Ecology)

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Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then... mark your new answer with a cross . 1 The diagram shows a magnified human red blood cell. (a) The actual diameter of this cell is 7.20µm. Calculate the magnification of this diagram. (b) A regular sphere with a diameter of 7.20µm has a surface area of 162.86µm2 . (i) Calculate the volume of a sphere with a diameter of 7.20µm. Use the formula V = 4/3πr3 (ii) Explain how a red blood cell with the same diameter as this sphere enables it to carry out its functions in transporting gases in the blood. 2 The biodiversity of habitats can be measured by recording the species present. (a) Describe two reasons why biodiversity of habitats should be maintained. (b) A student investigated the plant species growing in a sand dune habitat. Plants were identified and counted in two regions, A and B, of the sand dune. The results for region A are shown in Table 1. Species Number of individual plants sea holly 8 sand couch 10 sea bindweed 2 sand dropwort 3 prickly parsnip 7 Table 1 [Show More]

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