Selina solutions

Selina solutions

Grade 8

Transportation in plants | Short Answer Questions (SA)

Question 14

Practice Question:

In an experimental set-up, a dye was placed at the bottom of a beaker filled with water as shown in figure A, below. After some time, the entire water in the beaker got coloured uniformly as shown in figure D.

(a) Name and define the phenomenon shown in the experiment.

(b) In all the four figures, two kinds of molecules are shown symbolically - larger and smaller. Which molecules are of the solute and which are of the solvent?

(c) If all the dark shaded molecules in A are tightly enclosed in a cell membrane, what will be the nature of movement of the molecules, if any?

Solution:

(a) The phenomenon shown in the experiment is diffusion, it is the movement of the molecules or atoms of a substance in any form from the region of higher concentration the region of lower concentration.

(b) The larger molecules are of the solute (dye).

The smaller molecules are of the solvent (water).

(c) As the concentration of solvent molecules is more in the left side of the figure A. The cell membrane will act as semi-permeable membrane and will allow on the solvent molecules of water to move towards the solute particles. So the solvent molecules will move towards the solute particles.

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subject-cta

Question 14

Practice Question:

In an experimental set-up, a dye was placed at the bottom of a beaker filled with water as shown in figure A, below. After some time, the entire water in the beaker got coloured uniformly as shown in figure D.

(a) Name and define the phenomenon shown in the experiment.

(b) In all the four figures, two kinds of molecules are shown symbolically - larger and smaller. Which molecules are of the solute and which are of the solvent?

(c) If all the dark shaded molecules in A are tightly enclosed in a cell membrane, what will be the nature of movement of the molecules, if any?

Solution:

(a) The phenomenon shown in the experiment is diffusion, it is the movement of the molecules or atoms of a substance in any form from the region of higher concentration the region of lower concentration.

(b) The larger molecules are of the solute (dye).

The smaller molecules are of the solvent (water).

(c) As the concentration of solvent molecules is more in the left side of the figure A. The cell membrane will act as semi-permeable membrane and will allow on the solvent molecules of water to move towards the solute particles. So the solvent molecules will move towards the solute particles.

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subject-cta
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