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What areas on a variegated leaf change colour?
in a variegated leaf only the green areas of the leaf turns blue black in colour when tested for starch what is the best way to explan that
What happened when a leaf covered with vaseline is tested for starch?
When a leaf covered with Vaseline is tested for starch, it will not show a blue-black color reaction with iodine. This is because the Vaseline creates a barrier that prevents the uptake of iodine by the leaf. As a result, the leaf cannot absorb iodine to form the starch-iodine complex, indicating that starch is not present in the covered areas. This experiment demonstrates that light and gas exchange are essential for photosynthesis and starch production in plants.
Why is it necessary to boil the ethanol tube in the water bath to test the starch in green leaf?
Boiling the ethanol tube in a water bath is necessary to remove chlorophyll from the green leaf, which can interfere with the starch test. The heat helps to break down the leaf's cellular structure, allowing the ethanol to extract pigments effectively. Once the chlorophyll is removed, the leaf can be tested for starch presence using iodine solution, which will turn blue-black in the presence of starch. This process ensures accurate results in identifying starch accumulation in the leaf.
What observations do you need to expect if starch is present when testing leaf for starch?
It can be observed that when testing for starch their must be a olour change of blue black after iodine solution was added.Before the colour change was green that changed to blue black of the whole procedure is been carried out.
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 areas on a variegated leaf change colour?
in a variegated leaf only the green areas of the leaf turns blue black in colour when tested for starch what is the best way to explan that
What colour does the leaf turn once iodine is added and is no starch?
When iodine is added to a leaf with no starch, the leaf will remain its original color (usually green). Iodine reacts with starch molecules, turning the leaf blue-black if starch is present.
A leaf was taken from a plant boiled with ethanol and tested with iodine solution what is it tested for?
The iodine test is commonly used to detect the presence of starch in a sample. If the leaf turns blue-black when treated with iodine solution after boiling with ethanol, it indicates the presence of starch in the leaf tissue.
What is the hypothesis of testing leaves for starch?
The hypothesis of testing leaves for starch is that leaves produce starch through photosynthesis and store it for energy. By conducting a test to detect the presence of starch in leaves, we can determine if photosynthesis has occurred in the leaf tissue being tested.
What happened a non green leaf is tested for starch?
A non-green leaf lacking chloroplasts will not be able to synthesize food which later on gets converted into starch. So it will not show the presence of starch in the test.
What is the answer A leaf was tested for starch the iodine solution stayed orange what does that tell you about the leaf?
If the iodine solution stays orange after testing a leaf for starch, it indicates that the leaf does not contain starch. Starch would typically turn the iodine solution blue-black in color. Therefore, the orange color suggests that the leaf did not produce a significant amount of starch through photosynthesis.
What is the role of iodine in testing a leaf for starch?
A hot bath of ethanol decolorizes the leaf by washing out the chlorophyll. If the leaf is not decolorized, you cannot see the blue-black stain that results from the iodine reacting with the starch.
What would be the conclusion after testing a leaf for starch?
Starch is produced by leaves during Photosynthesis, therefore if the leaf has not been exposed to light then it will not contain starch, and so when tested the Iodine will stay Yellow/Brown. Consequently if the leaf has been left in the light Photosynthesis will have taken place and when tested the Iodine will go Blue/Black showing that Starch is present. Hope this helps :)
What colour should the leaf turn when iodine is added?
The leaf should turn blue-black when iodine is added, indicating the presence of starch.
Why does only half of the leaf turn blue black when tested for the presence of starch with iodine solution?
The half of the leaf that turns blue black in the iodine test for starch is the part that was exposed to light during photosynthesis. Starch is produced in the chloroplasts of plant cells as a result of photosynthesis, so the areas of the leaf that were able to photosynthesize will contain starch and react with the iodine to give a blue-black color.
Why do only some parts of a variegated leaf make starch?
Only the green parts of variegated leaves contain chlorophyll, which is necessary for photosynthesis to produce starch. Without chlorophyll, the non-green parts lack the ability to photosynthesize and make starch. This results in only the green areas of the variegated leaf being able to produce energy through photosynthesis.
What observations do you need to expect if starch is present when testing leaf for starch?
It can be observed that when testing for starch their must be a olour change of blue black after iodine solution was added.Before the colour change was green that changed to blue black of the whole procedure is been carried out.
