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Why is the leaf discolored when testing for starch?
When testing for starch, the leaf is boiled in alcohol to remove the chlorophyll that may mask the iodine-starch color change. If the leaf turns blue-black after applying iodine, it indicates the presence of starch. If the leaf remains discolored, it suggests that starch is absent, as the iodine did not react with any starch molecules present in the leaf.
What effect does iodine have when added directly to a leaf in an experiment?
Iodine added directly to a leaf in an experiment can be used to test for the presence of starch. If the leaf turns blue-black, it indicates that starch is present in the leaf, as iodine reacts with starch molecules to produce this color change. This is commonly used in biology experiments to show the photosynthesis process in plants.
What happens if starch is present in leaf?
Starch presence in a leaf suggests an excess of glucose produced during photosynthesis. This excess is converted and stored as starch, serving as an energy reserve for the plant. Starch accumulation also indicates that the plant is undergoing optimal photosynthesis.
A chemical solution used to test starch is?
Iodine solution is commonly used to test for the presence of starch. When iodine solution is added to a sample containing starch, it will turn blue-black in color if starch is present.
What does the presence of blue color means in variegated leaf experiment of photosynthesis?
The presence of blue color in a variegated leaf experiment indicates that the leaf has starch content. This is because leaves with chlorophyll, which is responsible for photosynthesis, will turn blue when iodine is applied to test for the presence of starch. Blue color indicates starch accumulation due to photosynthesis occurring in the green parts of the variegated leaf.
