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Cell Structure and Organization — Biology STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyCell Structure and Organization3 Marks
Question
Write a note on cell wall in Eukaryotic cells.
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Answer

  • The rigid, protective and supportive covering, outside the cell membrane is called cell wall. It is present in plant cells, fungi and some protists.
  • Algae show presence of cellulose, galactans, mannans and minerals like calcium carbonate in cell wall.
  • In other plants, it is made up of hemicelluloses, pectin, lipids and protein.
  • Microfibrils of plant cell wall show presence of cellulose which is responsible for rigidity.
  • Some of the depositions of cell wall are silica (grass stem), cutin (epidermal walls of land plants), suberin (endodermal cells of root), wax, lignin.
  • Function:
    • Provides support, rigidity and shape to the cell.
    • Protects the protoplasm against mechanical injury and infections.

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