The structure of xylem and phloem is also different. While xylem is made up of tracheids and vessels, phloem is made up of sieve tubes which have many holes for transporting nutrients. Xylem is star-shaped, while phloem is round and actually surrounds the xylem .
What is the structure and function of xylem and phloem?
Xylem tissue transports water and nutrients from the roots to different parts of the plant , and also plays a role in structural support in the stem. Phloem tissue transports organic compounds from the site of photosynthesis to other parts of the plant.
What is the structure of xylem?
The xylem tracheary elements consist of cells known as tracheids and vessel members , both of which are typically narrow, hollow, and elongated. Tracheids are less specialized than the vessel members and are the only type of water-conducting cells in most gymnosperms and seedless vascular plants.
What is the structure of phloem?
Phloem is the vascular tissue in charge of transport and distribution of the organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body. It is typically composed of three cell types: sieve elements, parenchyma, and sclerenchyma .
What is the name of the structure made up from phloem and xylem?
Sclerenchyma . Together with xylem and phloem vessels, sclerenchyma fibres are also found within vascular bundles and provide structural support to the plant. They are made up of bundles of long, dead cells.
What is the structure and function of xylem?
Xylem is the specialised tissue of vascular plants that transports water and nutrients from the plant–soil interface to stems and leaves , and provides mechanical support and storage. The water-conducting function of xylem is one of the major distinguishing features of vascular plants.
What is xylem name the 4 elements?
- Tracheids: Tracheids are elongated tube-like structures. ...
- Vessels: Vessels are cylinder-like structures made of many cells called vessel members. ...
- Xylem Fibres: ...
- Xylem Parenchyma:
What are the similarities and differences between xylem and phloem?
| Xylem Phloem | These tissues move in a Unidirectional. (only in one direction – upward direction) These tissues move in a Bidirectional. (both ways – up and down) | Comprises | They live with hollow dead cells. They live with cytoplasm without the nucleus. | No of Tissues |
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How does xylem and phloem work?
The xylem distributes water and dissolved minerals upward through the plant , from the roots to the leaves. The phloem carries food downward from the leaves to the roots. Xylem cells constitute the major part of a mature woody stem or root.
What are the function of xylem and phloem in short?
Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants.
What are the four elements of phloem?
The four elements of phloem are Sieve tubes, Companion cells, phloem fibers, phloem parenchyma .
What types of cells are xylem and phloem?
| Xylem Phloem | They comprise of xylem vessels, fibre and tracheids. They comprise of phloem fibres, sieve tubes, sieve cells, phloem parenchyma and companion cells. |
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Why do phloem have no nucleus?
The cells that make up the phloem are adapted to their function: Sieve tubes – specialised for transport and have no nuclei. Each sieve tube has a perforated end so its cytoplasm connects one cell to the next. ... One or more companion cells attached to each sieve tube provide this energy.
Where is the xylem located?
Xylem can be found: in vascular bundles , present in non-woody plants and non-woody parts of woody plants. in secondary xylem, laid down by a meristem called the vascular cambium in woody plants. as part of a stelar arrangement not divided into bundles, as in many ferns.
Is xylem a source or a sink?
Unlike the xylem, which can only carry water upward , phloem carries sap upward and downward, from sugar sources to sugar sinks: Sugar sources are plant organs such as leaves that produce sugars.
