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What is the colour of the non-green parts of a leaf after a starch test?
Wiki User
∙ 9y ago
When conducting a starch test green and non-green leaves will react differently. Non-green leaves will not change color, remaining the same. However, green leaves will darken to black or nearly black color.
Wiki User
∙ 9y ago
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Why do only some parts of a variegated leaf make starch?
Photosynthesis, the process by which glucose(and by proxy, starch) is produced requires chlorophyll, which gives leaves the green colour.
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 parts of a leaf does not react to iodine?
then starch is not present...
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 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 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 does the presence of blue color means in variegated leaf experiment of photosynthesis?
By blue color I assume you mean an added dye that shows how some parts of the leaf can photosynthesize and others not. The easiest of these experiments is to place the leaf in boiling ethanol (alcohol) and when drained of colour spread out on a flat surface. Soak the leaf in iodine and the green parts will turn blue/black and the non green parts will stay the yellowish brown colour of iodine. The green parts contain starch (a more compact form of glucose) which makes iodine turn blue/black. The blue/black is what will show starch is present.
Result of starch test on variegated leaves?
the leaf that contains starch will turn blue/black if not it will stay the same colour
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.
What is the biological importance of variegated plants?
Leaves that do not have a uniform colour are called variegated leaves.
Why does the leaf change colour with iodine?
It turns black because starch is present because its making it because of photsynthesis
Test for starch in a leave by photosynthesis?
Test for Starch 1. Heat some water to boiling point in a beaker then turn out the Bunsen flame. 2. Use forceps to dip a leaf in the hot water for about 30 seconds. This kills the cytoplasm, dentures the enzymes and makes the leaf more permeable to iodine solution. 3. Push the leaf to the bottom of a test tube and cover it with alcohol (ethanol). Place the tube in the hot water. The alcohol will boil and dissolve out most of the chlorophyll. This makes colour changes with iodine easier to see. 4. Pour the green alcohol into a spare beaker, remove the leaf and dip it once into the hot water to soften it. 5. Spread the decolourized leaf flat on a white tile and drop iodine solution onto it. The parts containing starch will turn blue; parts without starch will stain brown or yellow with iodine
