What do you know about plants transport?

[Audio] What do you know about plants transport?.

[Audio] Topic: Transport In plants Learning Objective : To describe the structure of Plants tissues. To describe the structure of Xylem and phloem Key words: Xylem and phloem.

[Audio] . *spe of Simple +iSSUe in plants is described as non living {issue COmpcised of cells +hae have +hick walls hardened wifh lianin? Parencktsma *issues (ollenchgmm {issues Sclecenchyma {issues hin cellulose cell wall Func+ions pho+o Syn he sis storin wa+er • S40tinq nu+fien+s peckin ard cellulose cell wall Funcfions l•gnifieå cell wall mechanical, suppof+ elms*ici+q Funchon s • mechanical suppoc+.

[Audio] . multicellular hair epidermis collenchyma (hypodermis) parenchyma (general cortex) endodermis (starch sheath) sclerenchyma (pericycle) phloem cambium metaxylem protoxylem parenchyma medullary roy pith xylem Transverse Section of Dicotyledonous Stem.

[Audio] . In leaves, the xylem and phloem form the veins. In stems, the xylem and phloem are towards the outside. In roots, the xylem is in the middle surrounded by the phloem. Leaf 0 Stem Root Xylem Phloem Xylem Phloem Phloem Xylem Fig 2. Cross-sections of a leaf, stem and root showing the positions of the xylem and phloem..

[Audio] They transport water and minerals, and also serve to provide structural support • They are long cylinders made of dead tissue with open ends, therefore they can form a continuous column. Xylem vessels also contain pits which enable water to move sideways between the vessels. • They are thickened with a tough substance called lignin, which is deposited in spiral patterns to enable the plant to remain flexible • Water can only flow upwards.

[Audio] Phloem vessels are composed of sieve tube elements, which are long, living cells stacked end-to-end with porous sieve plates at their ends, and companion cells that provide metabolic support. Sieve tube elements lack a nucleus and many other organelles to allow for efficient transport, while companion cells maintain the metabolic functions,.

[Audio] Thank You. Thank You.