Question

diffrent between xylem and phloem??​

Answer 1

Explanation:

Xylem transports only minerals and waters from the roots. Phloem transports food materials that are prepared by the green parts of the plants to other parts of the plant. ... Xylem is the dead tissues at maturity, but no cell contents. Phloem is the living tissue, but not with the nucleus

Answer 2

Xylem:

It is also known as wood and is a vascular and mechanical tissue. Thick walled cells are found in the form of tabular passages. It conducts water and mineral and transport it into other parts of the plant body. Xylem consists of four types of cells called as elements-

• Vessels:

i) They are advanced element (generally found in angiosperms).

ii) Vessels a cylindrical tube like structures place one above the other in to in which form a continuous channel for efficient conduction of water.

iii) they are made up of row of cells.

• Tracheids:

i) They are along gated angular dead cells (primitive elements).

ii) They are mainly involved in conduction of water and minerals in gymnosperms.

iii) They are single celled.

iv) the walls of tracheids are very thick with a narrow lumen.

• Xylem Parenchyma:

i) there is small and thick walled parenchymatous cells subject for storage of starch (food).

• Xylem Sclenchyma:

i) They are non-living fibres with thick walls and narrow cavities provide mechanical support.

ii) Except xylem parenchyma, all other xylem elements are dead.

iii) They are lignified.

iv) The annual rings present in the trunk of a tree are xylem rings.

Phloem:

They are also consists of both parenchymatous and sclerenchymatous cells. Phloem consists of four types of elements-

• Sieve Tubes:

i) Sieve tubes are a cylinder tube like structures made up of elongated, thin walled cells placed end to end.

ii) The end walls of sieve tube cells are perforated by numerous pores called as sieve plates.

iii) Nucleus of sieve cells generates at maturity.

iv) Seive cells posses slime protein which is concerned with growth and repair of sieve cells.

• Companion cells:

i) Companion cells have dense cytoplasm and prominent nuclei.

ii) Companion cells and sieve cells are so called sister cells because they originate from single mother cell.

iii) they are generally associated with sieve tubes.

iv) They are thin walled cells.

• Phloem Parenchyma:

i) These are thin-walled living cells of parenchyma of Phloem.

ii) They store food and help in radial conduction of food.

• Phloem fibre:

i) These are thick walled, elongated spindle-shaped dead cells which posses narrow lumen.

ii) They give mechanical support to sieve tubes.

iii) They are also known as baat fibres.

iv) Bast fibres obtained from the plants such as jute, flax, hemp has commercial or economical value.

Functions of phloem:

Phloem transports photosynthetically prepared food materials from the leaves to storage organs and later form storage organs to the growing regions of the plant body.

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