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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 else can I help you with?
Why you use iodine to test the presence of starch but why not other chemicals?
Because it call sense the difference between a base and an acid.
What indicator substance is used to test a leaf for starch?
Iodine Solution is used to determine whether starch is present.
If a leaf is fossilized it would most likely form what type of fossil?
Probably, carbonateous fossil.
What might happen to the brittle leaf if you tried to spread it out on the white tile?
The iodine would then not spread.
What might happen to the brittle leaf if you tried to spread it on the white tile?
The iodine would then not spread.
Why did the leaf turn brittle in testing a leaf for starch?
The leaf turns brittle during the testing the leaf for starch because the ethanol extracts the all water content from the leaf.
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.
When testing for starch why the leaf is boiled?
to denature the enzymes going to kill the leaf
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 did you see on the leaf in the test tube when testing for starch?
Use iodine to test a leaf for starch | Plant Physiology | Biology
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 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.
When testing a leaf for starch why do you have to boil the leaf in water first?
so the waxy cuticles can rub off the surface of the leaf. a leaf has a cell wall and if you did not put the leaf in the boiling water it would not break down so therefore you would not be able to do a proper starch test on the leaf so the answer to this question is to break the cell wall down so you can test for starch properly i hope i helped you :) yeap
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 it is useful to remove the green colour from the leaf before testing iodine solution?
Removing the green color from the leaf before testing iodine solution allows for a clearer observation of the starch present in the leaf. The green color of chlorophyll can mask the color change that indicates the presence of starch when iodine solution is added. By removing the green color, it is easier to identify and analyze the starch content in the leaf.
What is the purpose of the alcohol in testing a leaf for starch?
It is to remove the chloroplast and dissolve in the alcohol and turn it green.
Why did leaf had to be boiled in ethanol when testing leaf for starch?
Boiling the leaf in ethanol removes chlorophyll, which can interfere with the test for starch using iodine. This process helps to ensure accurate detection of starch in the leaf tissue without any color interference from chlorophyll.
