@scienceicon: 🍃🧪 THE STARCH TEST IN LEAVES – HOW DOES IODINE REVEAL STORED FOOD? How can we tell whether a leaf has produced and stored starch through photosynthesis? 🌱 🔬 THE SCIENCE BEHIND THE EXPERIMENT The iodine test is a simple practical experiment used to detect the presence of starch in plant leaves. What happens during the test? * The leaf is boiled in water to kill its cells. * It is heated in ethanol using a hot water bath to remove chlorophyll. * It is rinsed in warm water to soften it. * Iodine solution is added to the leaf. 🌈 OBSERVING THE RESULT * 🟤 Yellow-brown iodine colour – no blue-black starch reaction. * 🔵 Blue-black colour – starch is present! 💡 Why does it turn blue-black? Iodine forms a characteristic blue-black complex with starch, making it easy to identify its presence. ⚠️ Safety: Ethanol is highly flammable. Never heat it directly over a flame. Use a hot water bath under qualified supervision. 💬 QUIZ: What colour indicates a positive result in the starch test? 📌 SAVE and SHARE with a biology student! #StarchTest #BotanyPractical #Photosynthesis #PlantBiology #IodineTest

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Tuesday 03 November 2026 20:33:36 GMT