9th Class Science Sample Paper Sample Paper - 3 Term - 1

  • question_answer
      Write the main function of each of the following cell components. (a) Plasma membrane   (b) Mitochondria (c) Chromosomes            (d) Ribosomes (e) Lysosomes                   (f) Golgi apparatus


      (a) It regulates entry and exit of some materials in and out of the cell. It also prevents movements of some other materials.                                                                                                                                                            (1/2) (b) Also known as power house of the cell. Cellular respiration takes place in this organelle resulting in release of energy.                                                                                                                                                                (1/2) (c) Chromosomes contain genes. Genes are segments of DNA and are bearers of heredity characters. These   are responsible for inheritance.                                                                                                                                        (1/2) (d) Ribosomes are site of protein synthesis in a cell.                                                                                        (1/2) (e) These are also known as suicide bag of the cell. They contain digestive enzymes. They kill bacteria and remove worn out cell organelles.                                                                                                                              (1/2) (f) Golgi apparatus or Golgi body are the secretory organelle of the cell. They are also involved information of lysosomes.                                                                                                                                                                         (1/2)

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