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The set-up below illustrates a procedure that was carried out in the laboratory with a leaf plucked from a green plant that had been growing in sunlight.
(i) What was the purpose of the above procedure?
(ii) Give reasons for carrying out steps A, B and C in this procedure.
(iii) Name the reagent that was used at the step labeled D.
(iv) State the expected result on the leaf after adding the reagent named in (iii) above.