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.
Difference Between Tracheids And 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 the conducting elements in the xylem of angiosperms. They are also found in ferns and gymnosperms. It comprises a single cell with pointed ends.
When the secondary cell wall thickens, the tracheids become highly lignified. After lignification, the tracheids 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 found only in angiosperms and help in conducting water and minerals in the plants. During secondary cell wall thickening by lignification, dead, tubular cells are produced for conduction of water. 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-mentioned are a few of the similarities:
- Tracheids and vessesl are the components of the xylem.
- Both help in conduction of water along the stem and provide mechanical support to the plant.
- Both are tubular cells.
- They possess secondary lignification and become dead on maturity.
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