Food, nutrients, water, minerals are transported from roots to leaves by two types of vascular tissues, viz, xylem and phloem.
Xylem tissue transports water and minerals from roots to other parts of the plants, with the help of tracheids and vessels. These Xylem tissues are also known as tracheary elements.
Cells of tracheids and vessels die at maturity, they have lignified walls, and they are present in primary as well as secondary Xylem. Below are some major differences between tracheids and vessels.
Tracheids vs Vessels
Following are the important difference between tracheids and vessels:
|In all vascular plants||In angiosperms|
|Type of cells|
|Lateral||End to end|
|1 mm||10 cm|
|Surface to volume ratio|
Transverse or diagonal
|Less large pits||Large small pits|
What are Tracheids?
Tracheids are present in the xylem of angiosperms. They are conducting elements. They are also found in gymnosperms and ferns. Tracheid cells have pointed ends.
The tracheids become highly lignified on thickening of the secondary cell wall and become dead. Tracheids also provide mechanical support to the plants. They can also hold water against the force of gravity due to high surface area to volume ratio.
What are Vessels?
Vessels are present only in angiosperms. They help in conducting water and minerals in the plants. After secondary cell wall thickening and lignification, dead and tubular cells are formed. These vessels do not contain protoplasm on maturity.
Similarities between Tracheids and Vessels
The tracheids and vessels are also similar in a number of ways. Below are a few of the similarities:
- Tracheids and vessels are the components of the complex xylem tissue.
- Both help in conduction of water along the stem and provide mechanical support to the plant.
- Both cells are tubular.
- Secondary lignification is present in both cells. They become dead on maturity.
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