What happens when RHEO leaves are boiled in water first and then a drop of concentrated salt solution is put on it?

Thus, the correct option is A) The cells get killed on boiling so no plasmolysis. Note: The addition of the sugar syrup to the dead Rhoeo leaves results in halting the osmotic process.

Table of Contents Show

What happens if the RHEO leaves are boiled first and then kept in hypertonic solution?
What will happen when we keep a boiled leaf in sugar solution?
What effect does boiling water have on leaf?
Why is leaf boiled in water before doing starch test?
Why do we boil the leaf in hot water?

What happens if the RHEO leaves are boiled first and then kept in hypertonic solution?

When Rheo leaves are boiled, the cells present in the leaves die. So, when they are placed in hypertonic solution such as sugar syrup, nothing will happen as liquid cannot pass through dead cell membrane. The cell loses its permeability as they are dead.

What will happens when RHEO leaves?

Boiling Rheo leaves, kills their cells and cell organelles, cell wall. Due to this, all the cell loses its integrity and all cellular components come out of the cell. Therefore, osmosis does not take place and no plasmolysis observed.

What happens when strong salt solution is placed on boiled Rheo leaves?

The process that will take place here is plasmolysis, which is the collapse or shrinking activity of cells due to loss of water. The cells get plasmolysed because the strong salt solution is hypertonic to cell cytoplasm and hence water molecules will move out of the cells into the concentrated solution.

What will happen when we keep a boiled leaf in sugar solution?

What happens when rheo leaves are boiled in water first and then a drop of sugar syrup is put on it? Answer: When rheo leaves are boiled, this will shrink due to high temperature. The solute content within the leaves will falls out during heating due to osmosis.

Boiling the leaf damages the membranes of the cells allowing the pigments to be leached out of the cells. After leaching, the iodine solution added will combine with any starch in the cells producing a dark purple to black pigment in the leaf.

Why is it necessary to boil the leaf in alcohol?

Complete answer: We boil the leaf in alcohol when we are checking it for starch to eradicate chlorophyll, which is the green pigment present in leaves. During the starch test, we observe the colour change of leaf from brown to blue when iodine is put on the leaf as iodine reacts with the starch present in the leaf.

Why are leaves boiled in water?

It is very important to dip the leaves in boiling water before adding the iodine solution while conducting the starch test. This helps to get rid of the waxy cuticle that blocks the entry of iodine, damages cell membranes to form starch granules in cytoplasm and chloroplasts.

Why does boiling a leaf kill it?

Why does the leaf have to be boiled?

We boil the leaf in alcohol when we are testing it for starch because to remove the green pigment chlorophyll present in it. For the starch test, we need to observe the colour change from brown to blue when iodine is put on the leaf.

What happens when we boil the leaf in alcohol?

Boiling the leaf in alcohol removes chlorophyll present in it. By this we can properly identify the starch present in the leaf.

What happens to leaf when boiled in alcohol?

Leaf is boiled in alcohol to remove the chlorophyll from the leaf that adds dark green color so that starch particles can be easily seen under the microscope.

What effect does boiling water have on leaf?

heat a plant leaf in boiling water for 30 seconds (this kills the leaf, stopping any chemical reactions) 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)

Why is leaf boiled in water before doing starch test?

Why is the leaf again boiled in hot water?

We boil the leaf in alcohol when we are testing it for starch because to remove the green pigment chlorophyll present in it. Hence to remove the green pigment present in the leaf we boil the leaf in alcohol when we are testing it for starch.

Why did he boil the leaf in alcohol?

We boil the leaf in alcohol when we are checking it for starch to eradicate chlorophyll, which is the green pigment present in leaves. Hence to dissolve the chlorophyll or the green pigment present in the leaf we boil the leaf in alcohol when we are testing it for starch.

Why do we boil the leaf in hot water?

Answer: This procedure kills a leaf, disrupts the cell membranes and softens the cuticle and cell walls. This makes it possible to extract the chlorophyll with hot ethanol and also allows the iodine solution to penetrate the cells and react with any starch present.

Answer: When rheo leaves are boiled, this will shrink due to high temperature. The solute content within the leaves will falls out during heating due to osmosis. The cells are being destroyed by heating and boiling up further. Cells are set to die. So there will be no more osmosis after sugar syrup is added and also there is no plasmolysis process.

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