WAEC Biology 2017 Theory — Question 12
Question 12 of 26 from the West African Examinations Council (WAEC) Biology 2017 Theory paper, with the correct answer and a full explanation.
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2(d) Outline the procedure used for testing for starch in a leaf.
Model answer
How to test for starch in a leaf: Heat the leaf in boiling water; Heat it in boiling ethanol; Wash the leaf with water and then spread it on a white tile; Add iodine solution and allow it to stand for a few minutes. NB: If starch is present, the leaf turns blue-black.
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