Question

write one functional difference between xylem and pholem?​

Answer 1

Answer:

Following are the important differences between xylem and phloem:

Xylem Phloem

Definition

Xylem tissues are the tubular-shaped structure, with the absence of cross walls. This tissue resembles the shape of a star. Phloem tissues are tubular-shaped, elongated, structures with the presence of walls with thin sieve tubes.

Location

It is located in the centre of the vascular bundle. It is located on the outer side of the vascular bundle.

Fibres

Xylem fibres are smaller. Phloem fibres are larger.

Found In

They are present in roots, stems and leaves. They are present in stems and leaves, which later transports and grow in roots, fruits and seeds.

Movements

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

The total amount of xylem tissue is more. The total amount of phloem tissue is less.

Features

It consists of tracheids, vessel elements, xylem parenchyma, xylem sclerenchyma and xylem fibres. It consists of four elements: companion cells, sieve tubes, bast fibres, phloem fibres, intermediary cells and the phloem parenchyma.

Functions

Transports soluble mineral nutrients and water molecules from the roots to the aerial parts of the plant. Transports food and other nutrients including sugar and amino acids from leaves to storage organs and growing parts of the plant.

Vascular Bundles

Forms vascular bundles with phloem. Forms vascular bundles with xylem.

Functions

Provides mechanical strength to the plant and helps in strengthening the stem. Translocates the synthesized sugars by the photosynthetic areas of plants to storage organs like roots, bulbs and tubers.

Functions

It is responsible for replacing the total amount of lost water molecules through transpiration and photosynthesis. It is responsible for transporting proteins and mRNAs throughout the plant.

Answer 2

★ Xylem :

• Transportation of Water and ions .

• Most of the cells are dead.

• They have thick walls and unidirectional that is only one way the substances can flow vertically .

• Is divided into :

1. Xylem Fibres
2. Vessels
3. Trachieds
4. Xylem Parenchyma

• Small

• Found in the centre

★ Phloem :

• Transportation of food and other materials .

• Holes in walls.

• Both directional flow.

• All are living except the Phloem Fibres.

• Divided into :

1. Phloem Fibres
2. Companion cells
3. Seive tubes
4. Phloem Parenchyma

• Large

• Outer area .