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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 :)
Wiki User
∙ 12y ago
Wiki User
∙ 8y agoif the test is being performed after extraction/isolation of the starch from the leaves it will give the positive results i.e. presence of the starch can be identified and the starch content is quantifiable. but if the entire leaves are being tested, test will not give the accurate result or no result. Hence, before testing for starch in an entire leaf, the veseline/wax has to be removed.
Bethlehem Bacha
The end result of a starch test on a leaf would make it either brown or blue-black. If starch has been produced (that is if photosynthesis has occurred), the leaf would turn blue-black, otherwise, it would remain brown.
Wiki User
∙ 13y agothis experiment shows that plants do manufacture food during the process of photosynthesis and that starch is indeed present in green leaves.
Chikota Slam
Bethlehem Bacha
Chikota Slam
- Starch indeed present in green leaves and green leaves undergoes photosynthesis process.
- Iodine solution is suitable for the test of starch in leaves .
Wiki User
∙ 11y agoThere is no starch
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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 on the white tile?
The iodine would then not spread.
What might happen to the brittle leaf if you tried to spread it out 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.
When testing for starch why the leaf is boiled?
to denature the enzymes going to kill the leaf
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.
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.
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?
Ethanol dissolves chlorophyll hence further phtosynthetic activity is stopped in the abscence of light and the leaf becomes transparent (colorless). the colorless leaf takes better stain with iodene while testing for the presence of starch.
How is starch produced in the leaf?
When the plant is kept in sunlight the starch is formed in leaf.
Why do you need to remove chlorophyll from a leaf when testing for starch?
Chlorophyll has a function of converting starch into glucose and other simpler plant products.Thats why we have to remove cholorphyll before starting a test for starch.
How do you determine the location of starch in a leaf?
To determine the location of starch in a leaf, one can examine it under the microscope and apply one small drop of iodine to the leaf. The parts of the leaf that turn purple contain starch.
Does the leaf contain starch?
no
