wHat would happen if variegated leaves are treated with iodine solution?

wHat would happen if variegated leaves are treated with iodine solution?

Answer: The green part will turn blue black when iodine was added while the part which was not green did not show any change. It is because the green part contained chlorophyll in it.

wHat Colour does the iodine go when placed on a leaf that does not contain starch?

Answer: it doesnt change its color it will be the same since there is no starch in it.

wHat Colour does iodine turn in the presence of starch?

blue/black colour
In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test. For example, if iodine is added to a peeled potato then it will turn black. Benedict’s reagent can be used to test for glucose.

What are variegated leaves Class 10?

The leaves which are partly green and partly white are called ‘variegated leaves’. * The plants such as croton and coleus have variegated leaves which are partly green and partly white.

Why was iodine added to the leaf?

Starch testing Iodine solution is used to test leaves for the presence of starch. You need to: add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf – it turns white so it is easy to see the change in colour)

What colour will the lower part of the leaf give with iodine solution Why?

Additional Information: The inner part of the leaf turns blue-black on adding iodine solution which was originally green and shows that starch is present in the inner part of the leaf. Through this observation, we can conclude that photosynthesis takes place in the presence of chlorophyll to make starch.

What is the Colour of iodine solution?

Iodine Test A solution of iodine (I2) and potassium iodide (KI) in water has a light orange-brown color.

Why does iodine change color in starch?

Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil. This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.

What does iodine solution mean?

iodine dissolved in a solution of potassium iodide, used in chemistry to test for starch. Chemicals, chemical compounds & gases.

Why does a leaf turn dark when iodine is added?

Expert Answers. Once the pigments have been removed, the leaf is treated with iodine solution. Iodine is an indicator chemical for starch; when the two come in contact, the starch turns a very dark color. If the leaf in your experiment turned dark, then you would conclude that there was starch stored in the cells,…

What happens when you add iodine to starch?

Only the parts that were green become blue/black with iodine solution, showing the importance of chlorophyll in photosynthesis. The parts without chlorophyll do not photosynthesise, and so they do not make starch and the iodine does not change colour.

How is a leaf treated with iodine solution?

In your experiment, you took a leaf that had been allowed to do photosynthesis, you boiled it to kill it and remove the waxy cuticle, then placed it in alcohol to remove the chlorophyll and other plant pigments. Once the pigments have been removed, the leaf is treated with iodine solution.

Which is part of a leaf does not make starch?

The parts without chlorophyll do not photosynthesise, and so they do not make starch and the iodine does not change colour. The leaf on the left is a variegated leaf. The green parts contain chlorophyll and photosynthesise to make starch. The white part of the leaf does not contain chlorophyll, so does not photosynthesise.