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The presence of starch in plants indicate that photosynthesis has occurred. The process of testing the presence of starch uses iodine solution that turns to blue-black on a positive test.
Wiki User
∙ 9y ago
Wiki User
∙ 16y agobecause the plastic bag has small pores that let in the iodine but does not let the starch out because its molecules are to big
Wiki User
∙ 10y agoStarch is the product of photosynthesis, so logically, if there is starch, then the process is occuring.
Wiki User
∙ 13y agoit will apear blue
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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 effect does iodine have when added directly to a leaf in an experiment?
it becomes blue black showing that starch is present.
How does starch's location in leaves prove photosynthesis?
To clarify: We boiled alcohol with a leaf and tested for starch with iodine (present in the veins), We also covered a leaf with tin foil and came back the next day. The leaf was more green in the veins and more discolored farther away from the veins. This lab was suppose to show us glucose is made by the leaf, but all it proves is that starch is in the veins, right?
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 to destarch a plant?
a leaf (plant) should be destarched before photosynthesis investigations because the starch already present in the plant may mislead the result . hence if a destarched plant is used for the experiment then the amount of starch present at the time of the experiment will be nil and affter the experiment is compleded the amount of starch present in the leaves woul give the rate of photodynthesis as starch id prepared during photosynthesis
What parts of a leaf does not react to iodine?
then starch is not present...
What is the answer A leaf was tested for starch the iodine solution stayed orange what does that tell you about the leaf?
the iodine stayed orange because the starch wasn't present
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 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 function of iodine?
Iodine solution is commonly used to test for starch. If starch is present in a substance (e.g. a leaf which undergone photosynthesis) then the iodien solution would turn blue black. If no starch is present then it remains as light brown.
What effect does iodine have when added directly to a leaf in an experiment?
it becomes blue black showing that starch is present.
How is starch produced in the leaf?
When the plant is kept in sunlight the starch is formed in leaf.
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 :)
Why does the leaf change colour with iodine?
It turns black because starch is present because its making it because of photsynthesis
What happens when iodine solution turns blue-black what substance is present?
Starch is present. Check a potato with iodine.
How does starch's location in leaves prove photosynthesis?
To clarify: We boiled alcohol with a leaf and tested for starch with iodine (present in the veins), We also covered a leaf with tin foil and came back the next day. The leaf was more green in the veins and more discolored farther away from the veins. This lab was suppose to show us glucose is made by the leaf, but all it proves is that starch is in the veins, right?
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.
