Question

explain the secondary cell wall​

Answer 1

the secondary cell wall is a structure fount in many plant cell located between cell wall and the plasma membrane

Answer 2

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The secondary cell walls of the tracheary elements are specialised to withstand the negative pressures generated during the transport of water and solutes. Bean seedlings grown in the presence of the PAL inhibitor AOPP fail to synthesise and deposit normal levels of lignin in the secondary cell wall10. Consequently, the tracheary elements of these plants collapse inwards. A number of Arabidopsis mutants have been isolated that exhibit a similar phenotype. These mutants have been named irregular xylem (irx) due to the collapsed appearance of their tracheary elements. To date, 12 mutants have been isolated from at least 5 different complementation groups (Table 1). Four of these complementation groups correspond to plants that exhibit decreased cellulose deposition in the secondary cell wall. The remaining complementation group appears to exhibit decreased lignin deposition in the secondary cell wall.

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