Q. 35.0( 1 Vote )

The diagram given below represents an experimental set-up to demonstrate a certain process. Study the same and answer the questions that follow:



(a) Name the process.

(b) Define the above-named process.

(c) What would you observe in the experimental set-up after an hour or so?

(d) What control experiment can be set up for comparison?

(e) Keeping –hair, cell and its surroundings, name the parts that correspond to (1) concentrated sugar solution (2) parchment paper and (3) water in the beaker.

(f) Name any other substance that can be used instead of parchment paper in the above experiment.

(g) Mention two advantages of the process to the plants.

Answer :

(a) The process shown in the above diagram represents osmosis.


(b) Osmosis is defined as the diffusion of water molecules across a semi-permeable membrane from a more dilute solution, that is, with a lower solute concentration to a less dilute solution, which is with a higher solute concentration.


(c) After an hour so we would observe a gradual rise of the sugar solution in the thistle funnel from its initial level.


(d) To set a control for this experiment the same setup should be taken with plain water filled in both beaker and the thistle funnel and add a marking on the initial position on the thistle funnel.


(e) Keeping in mind the root hair cell and its surroundings the name of the corresponding parts are:


i. Concentrated sugar solution: Cytoplasm of the root hair cell.


ii. Parchment paper: Cell membrane, that is, the semi-permeable membrane.


iii. Water in the beaker: water in the soil.


(f) As parchment paper acts as a semi-permeable membrane the example of another semi-permeable membrane could be cellophane paper or animal bladder.


(g) The two advantages of osmosis to plants are:


i. Osmosis helps maintain turgidity of the cells and in the uptake of water and nutrients from its surrounding.


ii. Regulation of osmosis in the guard cells of the leaves helps in the opening and closing of stomata


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