Name the constituent cells of xylem and phloem tissues and write one function of each.
Answers
Xylem contains four types of cells, such as xylem parenchyma, xylem fibres, tracheids and vessels.
(1) Xylem parenchyma: store metabolites produced from metabolism of plant. Also help in short distance transport.
(2) Xylem fibres: provide mechanical support. The walls of xylem fibres are lignified and protoplasm is absent.
(3) Xylem tracheids: transport of water and mineral salts.
(4) Xylem vessels: conduction of water and mineral. These cells are dead.
Phloem also contains four types of cells such as phloem parenchyma, phloem fibres, companion cells and sieve tubes.
(1) Phloem parenchyma: transport of nutrients and storage of organic food.
(2) Phloem fibres: they are non-living component of phloem. They provide mechanical support.
(3) Companion cells: provide ATP and nutrients to carry out cellular functions.
(4) Sieve tubes: Transport of carbohydrates especially sucrose.
Answer:
Xylem and phloem are two vascular tissues which play a role in transportation of food and water. These are the constituents of phloem and xylem tissues.
Xylem tissues has
- Tracheids
- Vessels
- Xylem parenchyma
- Xylem fibers
In xylem tissues tracheids and vessels transport water from roots to other parts of the plants.
Phloem tissue has
- Sieve tube
- Companion cells
- Phloem parenchyma
- Phloem fibers
In phloem tissue sieve tube and companion cells transport food from leaf to other parts of the plant.