4. Add the samples to a test tube containing 15 mL of \( 90 \% \) ethanol to remove pigmenis. 5. Gently wash the leaves with cold water. 6. Spread the leaves evenly on a white tile, and add a few drops of iodine solution to various parts of the leaves. Observe and record any changes in the colors of the leaves. The student observed and recorded that all three samples from the green portions of the leaves turned blue-black, while the white portions remained colorless. Do the results of the student's experiment support the hypothesis? The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the glucose produced during photosynthesis was converted to starch. The results do not support the hypothesis because the portions of the leaves lacking chlorophyll tested negative for starch, indicating the glucose produced during photosynthesis was not converted to starch. The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the starch produced during photosynthesis was not converted to glucose. The results do not support the hypothesis because the portions of the leaves lacking chlorophyll tested negative for starch, indicating the starch produced during photosvnthesis was converted to alucose
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Bonus Knowledge
Did you know that the experiment you're describing relates closely to the classic "Iodine Test for Starch," a method that dates back to the 19th century? Scientists have been using iodine to reveal the presence of starch since it turns blue-black in contact with it! This simple yet effective test has proven fundamental in botany and education, helping students visualize the processes of photosynthesis and understand that only chlorophyll-rich areas of a plant can produce starch through photosynthesis. As for real-world applications, understanding how plants perform photosynthesis is crucial for fields like agriculture and environmental science! This knowledge helps farmers optimize crop yields by selecting the right plants that can effectively convert sunlight to energy and store it as starch. Moreover, it informs conservation efforts aimed at safeguarding photosynthesis-capable plants essential for carbon sequestration in our ever-warming world. So, next time you see a green leaf, remember it's a powerhouse of energy production!
