Activity 5.4 Class9 Science The Fundamental Unit of Life
Activity 5.4 Class 9 Science belongs to Chapter 5 The
Fundamental Unit of Life Class 9 Science. You will get a complete
solution with an explanation and conclusion. After reading activity 5.4, you
will be able to answer the questions based on the activity.
Activity 5.4 Class 9 Science Chapter 5
You are suggested to study NCERT activity 5.4 class 9 science chapter 5
explanation with a conclusion so that you can attempt questions based on activity 5.4 class 9 science.
Activity 5.4 Class 9 Science
· Put dry raisins or apricots in plain water and leave them for some time. Then place them in a concentrated solution of sugar or salt. You will observe the following
a. Each gains water and swells when placed in water.
b. However, when placed in the concentrated solution, it loses water and consequently shrinks.
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Observation Activity 5.4
Class 9 Science
Raisins swell in water and shrink in concentrated solution.
Explanation Activity 5.4 Class 9 Science
Dried raisins have no water inside. When these dried
raisins are placed in plain water.
In this case, the outside solution is very dilute. The raisins
will gain water and swell. This phenomenon is known as Endosmosis.
Osmosis – It is the passage of water
from a region of high water concentration through a semi-permeable membrane to
a region of low water concentration.
Now, these raisins are placed in concentrated sugar or
salt solution, in this case, more water from swelled raisins diffuses into the beaker. This phenomenon is known as Exosmosis.
Conclusion Activity 5.4 Class 9 Science
This activity demonstrates the phenomenon
of Osmosis –(i) Endosmosis (ii) Exosmosis
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