9th Class Science The Fundamental Unit of Life Question Bank 9th CBSE Science The Fundamental Unit of Life

  • question_answer
      What are lysosomes, peroxisomes and centrosome and write their functions?

    Answer:

                        (i) Lysosomes These are membrane bound sacs that are filled with digestive enzymes. They are found in cytoplasm of all except mammalian RBCs and are formed by Golgi apparatus. Function It help to keep the cell clean by digesting any foreign material that enters the cell.                                                                      (1) (ii) Peroxisomes These  are  found  in  plant photosynthesising cells and liver-kidney cells of  vertebrates and they are bounded by a unit membrane. Function They are involved in removal of toxic substances by oxidative reactions. In plant cells, they help in photorespiration.             (1) (iii) Centro some It consists of two granule-like centrioles and found in animal cell only. Function It helps in cell division in animal cells.                      


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