Q. 85.0( 4 Votes )

Mention the compo

Answer :

In higher plants, "Xylem" and "phloem" comprises the transport system. The basic function of these components is,

Xylem:- In xylem tissue, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting
channels reaching all parts of the plant. At the roots, cells in contact with the soil actively take up ions. This creates a difference in the
concentration of these ions between the root and the soil. Water, therefore, moves into the root from the soil to eliminate this difference. This means
that there is a steady movement of water into root xylem, creating a column of water that is steadily pushed upwards

Phloem:- transports amino acids and other substances. These substances are specially delivered to the storage organs of roots, fruits and seeds and
to growing organs. The translocation of food and other substances takes place in the sieve tubes with the help of adjacent companion cells both
in upward and downward directions. In pholem translocation is done with the utilisation of energy. Material like sucrose is transferred into phloem tissue using
energy from ATP. This increases the osmotic pressure of the tissue causing water to move into it. This pressure moves the material in the
phloem to tissues which have less pressure.

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