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if you cover a boiled leaf in iodine you can see how much starch is in the leaf

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15y ago

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What was the purpose of keeping the leaf in the dark and then covering it with a cardboard cut-out?

The purpose of keeping the leaf in the dark is to prevent photosynthesis from happening. By covering it with a cardboard cut-out with a specific design, you can control which parts of the leaf are exposed to light, allowing for experiments on the effects of light on photosynthesis in different areas of the leaf.


What is the outermost covering of a leaf?

epidermis is the outermost covering of the leaf


What will happen to a leaf when you put iodine solution into it?

If iodine solution is added to a leaf, it will turn blue-black in color. This is due to the presence of starch in the leaf which reacts with iodine to produce this color change.


What colour does the leaf turn once iodine is added and is no starch?

When iodine is added to a leaf with no starch, the leaf will remain its original color (usually green). Iodine reacts with starch molecules, turning the leaf blue-black if starch is present.


Why did the leaf turn blue-black when iodine was added.?

The leaf turned blue-black when iodine was added because iodine reacts with starch, which is present in the leaf. This reaction forms a blue-black complex, indicating the presence of starch in the leaf.


What color does a iodine turn when there is no starch in a leaf?

Iodine turns a yellow-brown color when there is no starch present in a leaf. This color change indicates the absence of starch, which is detected by the iodine as it interacts with the leaf's compounds.


What effect the iodine solution have on a leaf?

Iodine solution can test for the presence of starch in a leaf. When iodine solution is applied to a leaf, it will turn blue-black in areas where starch is present. This is because iodine reacts with starch to form a bluish-black complex.


Why do we rinse the leaf I water?

The leaf was rinsed in water to rehydrate it. Iodine solution is an aqueous solution of iodine/potassium iodine - potassium tri-iodide; water is needed inside the leaf to enable penetration by diffusion.


Why do we dip the leaf in water before adding the iodine solution?

Dipping the leaf in water before adding the iodine solution helps to soften the leaf tissue, making it easier for the iodine solution to penetrate and react with the starch present in the leaf. This process enhances the visibility of the starch by allowing the iodine solution to spread more evenly throughout the leaf.


Why the leaf could not simply be dipped in iodine?

The leaf could not be simply dipped in iodine because it has a waxy cuticle layer that repels water, making it difficult for the iodine to penetrate through and properly stain the leaf for a starch test. To allow the iodine to effectively interact with the leaf and detect starch, the leaf needs to be boiled in alcohol to remove the waxy cuticle first.


How do you destarch a leaf?

to destarch a leaf, you have to have two things first. A leaf and a bottle of iodine solution. You need iodine solution to separate the sugar molecules (glucose molecules) to the leaf itself, on the upper epidermis of a leaf, on the cuticle.


WHY WAS THE LEAF TURN WHEN IODINE SOLUTION WAS PLACE ON IT?

The leaf turned black when iodine solution was placed on it because iodine reacts with starch present in the leaf, forming a dark blue-black complex. This color change is a common test used to detect the presence of starch in a leaf.