At the end of photosynthesis, the green leaf is tested for starch and not glucose, because

Assessment: WAEC SSCE - Biology - 1995 (Objective) Subject: Biology

Question 1 Report

At the end of photosynthesis, the green leaf is tested for starch and not glucose, because
Answer Details
At the end of photosynthesis, green leaves are tested for starch rather than glucose because glucose is immediately converted into starch in the presence of light. In other words, plants use the energy produced by photosynthesis to make starch which can be stored for later use. Thus, it is easy to test for starch rather than glucose in leaves. The test for starch involves iodine solution which reacts with starch to produce a blue-black color, making it easy to identify the presence or absence of starch in the leaves.
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