WHAT IS CELL WALL AND ITS FUNCTION??

CELL WALL

DEFINITION;

★CELL WALL IS A NON-LIVING AND STRONG COMPONENT OF CELL.

PRESENCE;

★WE KNOW THAT NOT ALL LIVING ORGANISMS HAVE CELL WALL

 AROUND THEIR CELLS, LIKE ANIMALS AND ANIMAL LIKE PROTIST.

LOCATION;

★ IT IS LOCATED INSIDE THE PLASMA MEMBRANE.

FUNCTION;

★ IT PROVIDES SHAPE, STRENGTH, PROTECTION AND  SUPPORT TO THE

LIVING MATTER (PROTOPLASM) OF CELL.

LAYERS AND CHEMICAL COMPOSITION;

★ PLANT CELLS HAVE VARIETY OF CHEMICALS IN THEIR CELL WALLS.

PRIMARY WALL;

★ THE OUTER LAYER OF PLANT CELL WALL IS KNOWN AS PRIMARY WALL.

CHEMICAL;

★ AND CELLULOSE IS THE MOST COMMON CHEMICAL IN IT.

SECONDARY WALL;

★ SOME PLANT CELLS FOR EXAMPLE; XYLEM CELLS,  ALSO  HAVE 

    SECONDARY WALLS ON THE INNER SIDE OF PRIMARY WALL.

CHEMICAL;

IT IS MUCH THICKER AND CONTAIN LIGNIN CHEMICAL. 

MIDDLE LAMELLA;

★ THE MIDDLE LAMELLA IS FIRST TO BE FORMED IN BETWEEN 

     THE PRIMARY WALLS OF NEIGHBOURING CELLS.

PLASMODESMATA;

★ THERE ARE PORES  IN THE CELL WALLS OF ADJACENT CELLS,

    THROUGH WHICH THEIR CYTOPLASM IS CONNECTED. THESE

    PORES ARE CALLED PLASMODESMATA. 

FUNGI AND MANY PROTISTS;

★ FUNGI AND MANY PROTISTS HAVE CELL WALL ALTHOUGH THEY

     DO NOT CONTAIN CELLULOSE. THEIR CELL WALLS ARE MADE OF 

    A  VARIETY OF CHEMICALS.

FOR EXAMPLE;

➤CHITIN

★ CHITIN IS PRESENT IN THE CELL WALL OF FUNGI. 

➤PEPTIDOGLYCAN

★ PROKARYOTES HAVE A CELL WALL COMPOSED OF PEPTIDOGLYCAN

    THAT IS A COMPLEX OF AMINO ACIDS AND SUGARS.

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