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Showing posts with the label OUTER COVERING OF CELL.

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 WA...