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

    Answer:

      (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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