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urine                              3
                       Tumour, infection
                     (b) Draw a neat labelled diagram of nephron.

               Q5.  (a)  Identify the given diagram and label A, B, C, D.                                         D
                                                                                            3


















                     (b) Write its role.

               Q6.  (a) What are the excretory products of human beings?                    5          D
                     (b) Explain the parts of human excretory system.
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