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In plants, diffusion and active transport are used to transfer materials into and out of the cells.
Active transport and passive transport
Active transport:
The type of transport which utilises energy to pump molecules against a concentration gradient is known as active transport.
Active transport: Pumps
This transport is carried out by membrane-bound proteins, which use energy to transport the substances across the cell membrane and are often referred to as pumps. These pumps transport the substances from a low concentration to a high concentration and is hence known as uphill transport.
Passive transport:
The type of transport which does not utilises energy to pump molecules along the concentration gradient is known as passive transport.
Types of passive transport:
- Osmosis
- Diffusion
- Facilitated diffusion
The movement of ions and molecules along the concentration gradient without the application of any external energy.
Diffusion:
Before and after diffusion
Diffusion is described as the free movement of solid, liquid and gaseous molecules from a higher concentration to a lower concentration without the usage of energy.
The process of diffusion
Reference:
https://upload.wikimedia.org/wikipedia/commons/4/45/Active_Transport_-_Protein_Pumps.png
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