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kritika chauhan- no. you can imitate a test .put 10 drops of dilute iodine solution on it. if it turns blue black than it contains starch. a blue black color indicate presence of starch in a food item. if you will do this test for a non green leaf it will be negative.
Maude Kulas
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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
Does the leaf contain starch?
no
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.
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 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.
Do variegated leaves contain starch?
sometimes the leaves which are not green contain chlorophyll. red /yellow like colored leaves contain it but the color pigment are higher than chlorophyll but the fact is colorless plants such as mushrooms doesn't contain it.
Why a yellow leaf doesn't change it's colour by putting iodine on it?
Because it doesn't contain green pigment, chloroplast... Green leaves changes to blue-black due to present of starch in chloroplast.
Where is starch stored in a variegated Coleus leaf?
The starch in a variegated Coleus leaf is stored in the pigmented parts of the leaf. Coleus is a flowering plant is usually considered an ornamental plant because of its color.
Why do green leaves turn blue black when iodine is added?
because the leaves have photosynthesized- glucose is produced. therefore, the excess glucose is converted to starch. The starch is then stored in the leaf-starch is what causes the "green" leaf to turn blue black, as iodine turns blue-black when it reacts with starch.:P
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.
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 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.
