1.1.1 Curing the test for starch, a green leaf is placed in boiling alcohol to A break the cell walls B to extract the chlorophyll. C to remove starch. - stop metabolic processes. (1)

When you place a green leaf in boiling alcohol, it serves the purpose of extracting chlorophyll from the leaf. This process helps to reveal the presence of starch when you subsequently add iodine. The boiling alcohol effectively disrupts cellular structures, allowing for a clearer indication of starch presence once the leaf is exposed to the iodine solution. After the alcohol treatment, you can test for starch by immersing the leaf in iodine solution. If the leaf turns blue-black, it indicates that starch is present. This classic experiment not only demonstrates photosynthesis but also offers a delightful glimpse into the workings of plant biology!