Vascular Tissues

Vascular Tissues

4.1

Vascular Tissues

The necessity of transport in plants:

Transport water and mineral salts to carry out photosynthesis and growth
Transport photosynthetic products to other parts of plants
Transport water for plant cell turgidity and for support
Transports organic acids in plants
Transport phytohormones in plants for response
Transports water in plants for cooling

Transport in plants is carried out by vascular tissues which consist of :

Xylem tissue: transport water and mineral salts from roots to shoots
Phloem tissue: transport photosynthetic product and other organic substances from shoots to other parts

The xylem tissue contains xylem vessel and tracheid as the main transport vessels,whereas the phloem tissue contains sieve tube and companion cell as the main transport vessels

The simillarities between xylem tissue and phloem tissue:

As vascular tissue
Trasnport substance in plants
Have parenchyma cell and fibres within the vascular tissue

The differences between xylem tissue and phloem tissue:

	Xylem Tissue
Main cell type	Xylem vessel & tracheid
Lignified wall	Lignified in the form of annular, spiral, scalariform, reticular and pit
Condition of the cell after mature	Death cells and cell contents degenerated Cells form a long and hollow vessel Have plate or nnote for the flow of water & mineral Have pits for the glow of water and minerals laterally
Materials transported	Water, minerals, salt & phytojhormones
Main function	Transport water and mineral in plants Provide mechanical support to plants

	Phloem Tissue
Main cell type	Sieve elemetns & companion cell
Lignified wall	Unlignified
Condition of the cell after mature	Living vells with degenerated organelles Cells form a long tube filled with cytoplasm Have sieve tubes for the flow of organic substance
Materials transported	Sucrose, amino acid, organic acid, phytohormones & water
Main function	Transport sucrose and other organic substances