Show Osmosis is a physical phenomenon in which water or solvent molecules move from dilute solution to a concentrated solution where both the solutions are separated by a semi-permeable membrane. In other words osmosis also can be defined as the movement of water molecules from its (water) higher concentration to its lower concentration through a semi-permeable membrane. In osmosis process movement of water molecules only occur between two deferentially concentrated solutions separated by a semi-permeable membrane. In plants or animals the cell membrane which separate two cells acts as semi-permeable membranes. Cell membrane or plasma membrane of plant cells and animal cells, egg's membrane, Goat's bladder membrane are the natural substance which act as semi-permeable membrane. Cellophane paper, Parchment paper, Viskins bag are the substances which act as semi-permeable membrane are artificial in nature. Here is an experiment on Oxygen is evolved by green plants during Photosynthesis Aim of the ExperimentTo demonstrate Osmosis process by Thistle funnel and egg's membrane.Requirements:-Beaker, Water, Sugar solution, Egg's membrane, an iron stand.Demonstration of Osmosis process-(A) Experimental Setup and (B) Control Setup Procedure for the experimentA wide mouthed thistle funnel with a narrow long stem was taken. Then an egg's membrane collected from an egg is tied tightly around the wide mouth of the funnel with the help of a thread or rubber band. Now dilute sugar solution is carefully poured into the stem of the funnel to a certain level. The wide mouth of the funnel containing sugar solution is now kept in a beaker with the help of an Iron stand. Now three fourths of the beaker is filled with plain water. A similar control setup also arranged but by taking plain water in the beaker and also plain water in Thistle Funnel. The apparatus are left undisturbed for 10 minutes and we observe the changes in the experimental setup as well as in control setup.ResultAfter few hours we find the level of sugar solution increases from its initial level in the experimental setup while there is no change in the level of water in the stem of Thistle Funnel in the control setup. This observation clearly indicates the movement of water molecules occurred from the beaker into Thistle Funnel in the case of experimental setup while in the control setup that there is no movement of water molecules from beaker into Thistle Funnel through egg's membrane because both the solutions are of same concentration.Precautions:-
Questions and answers related to the experiment
Here is an experiment on Experiment on Transpiration in plants with dicot leaves Here is an experiment on How to measure the rate of transpiration of a cut twig with Ganong's Potometer
Correct option is
The level of solution in thistle funnel will lower down
Diffusion of water from its pure state or dilute solution into a solution into a solution or stronger solution, when the two are separated by semipermeable membrane is called osmosis. In thistle funnel experiment, when sugar solution is added to a beaker after the process of osmosis stops. The solution of beaker becomes hypertonic, as a result of which exosmosis occurs in thistle funnel. Hence, level of solution in thistle funnel gets lowered.
Q1
What is the approximate dry weight contained by majority of herbaceous plants ?
Q2
If solute particles are added in pure water, its diffusion pressure will be
Q3
Identify the process taking place in the given experimental setup and choose the correct option.
Q4
Osmotic pressure is highest in which of the following plant type ?
Q5
A Plant cell become turgid due to
Q6
Match the following columns.
Q7
The pressure exerted by the protoplast due to the entry of water against the rigid cell wall is termed as
Q8
Term osmosis is specifically used to refer
Q9
Which one of the following has a significant role in solvent transport?
Q10
The rate of diffusion is dependent upon the permeability of the medium, it however |