Final answer:
The correct answer is not listed. The final color of the leaf after treating it with iodine solution in a starch test is typically blue-black if starch is present.
Step-by-step explanation:
The student's question is related to a biology experiment commonly used to test for the presence of starch in leaves. The procedure involving boiling water, boiling alcohol, and treatment with iodine solution is part of a test known as the Iodine Test for Starch.
When a leaf is plucked and subjected to boiling water, the process deactivates enzymes, making the starch within the leaf insoluble. Following that, immersing the leaf in boiling alcohol removes chlorophyll, leaving the leaf colorless or whitish. Finally, when the leaf is treated with iodine solution, starch present in the leaf will react with iodine and change color. The resulting color in presence of starch is blue-black. Thus, if starch is present in the plucked leaf, after being treated with iodine solution, it would turn blue-black, indicating a positive result for the starch test.
Given the steps provided in the procedure, the final color of the leaf after the test would be blue-black (option a). However, since 'blue' is not given as an option in the question and assuming that the list of options provided is comprehensive and one of them must be correct, we would need further clarification as none of the options accurately reflect the standard result of the test. The correct option as per standard biology knowledge should be 'blue-black', which is not listed. Therefore, based on the options provided, no correct option is present in the final answer.