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The leaf turns brittle during the testing the leaf for starch because the ethanol extracts the all water content from the leaf.
Destarching a leaf is a method used in an experiment to prove that there is starch exsisting within the leaf, Destarching a leaf is also a preparation used before the experiment, to remove all starches within the leaf-NR
Most of the starch contained in a leaf is located within chloroplasts.
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.
sunlight, water and CO2.
When the plant is kept in sunlight the starch is formed in 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.
The leaf turns brittle during the testing the leaf for starch because the ethanol extracts the all water content from the leaf.
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Destarching a leaf is a method used in an experiment to prove that there is starch exsisting within the leaf, Destarching a leaf is also a preparation used before the experiment, to remove all starches within the leaf-NR
Use iodine to test a leaf for starch | Plant Physiology | Biology
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.
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.
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.
It is to kill the cytoplasm, denaturate the enzyme and makes the leaf become more permeable to the iodine solution, therefor, we have to boil a leaf for starch test
The function of starch in the leaf is to provide energy for the cell for the different functions. When the starch in the plant cells degrades, carbon is released so that it can be utilized in the production of sucrose.
because of the presence of starch