During the preparation of a temporary slide of an onion epidermal cell, a Form Five student added a drop of iodine solution. The most likely observation is that the

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cell wall stains yellow-brown and the nucleus appears more distinct. Iodine solution (Lugol's iodine) stains cellulose cell walls yellow-brown and also stains the nucleus, making cellular structures more visible and distinct under the microscope. Onion epidermal cells do not contain chloroplasts and their vacuoles contain cell sap rather than starch, so a blue-black

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A) cell wall stains blue-black and the cytoplasm remains unstained

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B) nucleus stains yellow-brown and the vacuole stains blue-black

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C) cell wall stains yellow-brown and the nucleus appears more distinct

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D) chloroplasts stain blue-black indicating the presence of starch

During the preparation of a temporary slide of an onion epidermal cell, a Form Five student added a drop of iodine solution. The most likely observation is that the

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