Question

What happens when rheo leaves are boiled in water first and then a drop of sugar syrup?

Answer 1

Osmosis is the flow of water molecules across a cell's partly permeable membrane from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules.A selectively permeable membrane (also known as a partly permeable membrane) enables just specific molecules or ions to pass through it.

Complete answer:
The situation in the question is associated with the phenomenon of plasmolysis and osmosis.
Boiling Rheo leaves destroys the cells and organelles within the cells, as well as the cell wall. As a result, the cell's integrity is compromised, and all cellular components are expelled. As a result, no osmosis occurs, and no plasmolysis is detected.

Additional information:
Procedure for studying plasmolysis using rheo leaves.
Placing two glass slides on the table is a good idea.
Remove one of the rheo leaves from the Petri dish.
Fold the leaf in half and rip it along the lowest edge.
Pull two tiny pieces of thin translucent layer off the bottom epidermis of the rhoeo leaf with forceps.
On each glass slide, place the epidermal peels.
Take some sodium chloride $0.1$ percent solution from the beaker with a dropper.
On each slide, drop $1 - 2$ drops of solution.
Take the sodium chloride 5 percent solution from the beaker with another dropper.
On the following slide, drop $1 - 2$ drops of solution.
Using a needle, cover the peel of both slides with a cover slip.
Place the slides beneath the compound microscope one by one.
Examine them using a microscope.
We can see that cells in the sodium chloride $0.1$ percent solution are turgid, but cells in the sodium chloride 5 percent solution display plasmolysis after half an hour.

Note:
Plasmolysis is the loss of water by cells in a hypertonic solution. If the cell is in a hypotonic solution, deplasmolysis can occur, resulting in a decreased external osmotic pressure and a net flow of water into the cell. Plasmolysis is often observed in the leaves of plants and the rheo leaves are considered for microscopic examination of this phenomena in experimental settings.