XYLEM
Xylem is a conductive tissue and is responsible to transport water and minerals from roots to leave.Xylem is composed of four components-
- Xylem vessels(dead)
- Tracheid’s(dead)
- Xylem parenchyma(living)
- Xylem Fibers(dead)
- XYLEM VESSELS:
Xylem vessels are long tube like structures in which cells are placed end to end. Vessels are open ended and are responsible. to transport water and minerals.
- TRACHEID’S:
Tracheid’s are spindle shaped cells. They do not have open ends like vessels, so they pass water and minerals through pits(pits are non lignified area).
- XYLEM PARENCHYMA:
Xylem Parenchyma is a living part of the xylem and is responsible for storage of food.
- XYLEM FIBERS:
Xylem fibres have dead cells and are responsible to provide mechanical support to the plants.
PHLOEM
Phloem is a conductive tissue and is responsible to transport food from leaves to all parts of the plant. This process is known as translocation.It consist of four components.
- Sieve tubes
- Companion cells
- Phloem parenchyma
- Phloem fibre
1. SIEVE TUBE:
They are tube like structure in which cells are connected end to end. The end wall of sieve tube is called sieve plate which have small holes. These small holes allow food to pass through the sieve tube. Sieve tubes have cytoplasm but no nucleus.
2. COMPANION CELLS
Each sieve tube has a companion cell next to it. These companion cells have a nucleus and many other organelles. Companion cells help sieve tube in the transportation of food.
3. PHLOEM PARENCHYMA
It is responsible for the storage of food.
4. PHLOEM FIBRE
They are thread like structures made up of dead cells and are responsible to provide mechanical support to the plants.
PLEASE GIVE YOUR VALUABLE REVIEWS
QUESTIONS FOR SELF EVALUATION
- Which component(s) of xylem is/are living?
- What is the function of xylem?
- What is the function of phloem.
- What are pits.
- Name the process of movement of food from leaves to all body parts of the plants.