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Title: Cambridge IGCSE O level- Biology 0621 - Chapter 3 ppt
Description: This is the summary of chapter 3 (Movement in and out of cells). It covers active transport, Passive transport, diffusion and osmosis in fully explained easy to understand way. It also gives contains 2 experiments for diffusion and osmosis. This simple pdf will take you step by step to success!
Description: This is the summary of chapter 3 (Movement in and out of cells). It covers active transport, Passive transport, diffusion and osmosis in fully explained easy to understand way. It also gives contains 2 experiments for diffusion and osmosis. This simple pdf will take you step by step to success!
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By wiseoldbrain
Active Transport
Passive Transport
The movement of molecules across
the cell membrane using ATP
(Adenosine Triphosphate) is called
Active transport
...
There are 3 types of active transport:
Pump, Endocytosis and Exocytosis
...
The molecules always move from a
higher concentration to a lower
concentration
...
ATP: Rechargeable and renewable energy source
...
Diffusion is vey important in living organisms
...
❑Plants also use diffusion to get rid of oxygen
...
Distance: Shorter distance means faster diffusion
...
Size of molecules: smaller molecules can pass the barrier more easily
...
Osmosis
Osmosis is diffusion of water
...
As more water enters the cell, the cytoplasm swells up and
then bursts
...
When the water exits, the cell shrivels up
...
The cell wall doesn’t affect the osmosis process because it is fully
permeable
...
The turgidity helps a plant
stay upright and it also helps leaves to stay fresh and firm
...
The plant begins to wilt if it is flaccid
...
❑Place a narrow glass tube in the tubing and tie it tightly with a thread
...
We will notice that the level of liquid rises
...
Osmosis
Potato strip experiment
❑Cut out 3 equal sized strips of potatoes
...
The first should have 100ml pure water
...
4grams of salt
in 100ml water in the second beaker
...
❑Add 1 strip of potato in each beaker and wait for 20 minutes
...
The second strip should be almost the same because the solution is isotonic
...
Active Transport
Active transport is an energy-consuming process where substances are transported
against their concentration gradient
...
Even though
there is a higher concentration of nitrate ions inside the root hair cells than outside
in the soil, they are still able to take more nitrate ions inside using active transport
...
The protein channel lets in certain molecules inside the cell in return for a small
amount of ATP
...
Title: Cambridge IGCSE O level- Biology 0621 - Chapter 3 ppt
Description: This is the summary of chapter 3 (Movement in and out of cells). It covers active transport, Passive transport, diffusion and osmosis in fully explained easy to understand way. It also gives contains 2 experiments for diffusion and osmosis. This simple pdf will take you step by step to success!
Description: This is the summary of chapter 3 (Movement in and out of cells). It covers active transport, Passive transport, diffusion and osmosis in fully explained easy to understand way. It also gives contains 2 experiments for diffusion and osmosis. This simple pdf will take you step by step to success!