This article will contain osmosis lessons for JHS 2 pupils. You can check out and use them as a teacher or as a student you can lay hands on them.
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Integrated Science JHS 2: Osmosis lessons. This might be of help to you as a student or a facilitator. Read through carefully.
In today’s lesson, we are looking at Osmosis. By the end of the lesson you should be able to know
- What Osmosis is
- What a semi – permeable membrane
- The process of osmosis
- Applications of osmosis in living organisms.
Osmosis lessons
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Osmosis is the process whereby water molecules moves from a region of lower concentration to a region of higher concentration through a semi – permeable membrane.
In osmosis, only water molecules move into other substances such as sugar or salt. The water molecules are considered to be less concentrated whereas the molecules of the sugar are considered to be higher concentration.
Movement of water molecules occurs until both ends of the membrane is the equal or the same. Osmosis only occurs in water unlike diffusion which occurs in all the three states of matter.
What is a semi – permeable membrane?
A semi – permeable membrane is a material which allows selected substances to pass through it. So in osmosis what substances move through is known as the Semi – permeable membrane. There are two types of semi – permeable membrane, they are;
- Living semi – permeable membrane and
- Non – living semi – permeable membrane.
Natural Semi – permeable membrane are the living materials which allow some selected substances to pass through them. Examples are; skin of a frog or snake, yam, bladder of a pig, etc.
Also the non-living semi – permeable membrane is the non – living substances which allow selected materials to pass through them. Example is a cellophane paper.
Now let’s look at the process of osmosis[Osmosis lessons].
In osmosis, there are two basic methods of demonstrating it. Since we have two types of semi – permeable membrane, osmosis can be demonstrated using both the living and non –living permeable membrane.
For the purpose of today’s lesson, we are going to look at the non – living semi permeable membrane.
Application of osmosis in living organisms;
- Re-absorption of water in the tubules of the kidney
- Movement of water from the soil by root hairs
- Absorption of water in the large intestine
- Movement of water across the leaf cells.
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