Selina Class 9 Biology Respiratory System Solutions Quiz
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Questions and Answers

What is the function of ciliated epithelium in the respiratory passage?

  • It helps in motion, driving any fluid that is on them (correct)
  • It provides structural support to the respiratory passage
  • It secretes mucus to trap foreign particles
  • It absorbs oxygen from the air

    • Where does the breakdown of pyruvic acid occur in the presence of oxygen?

  • Endoplasmic reticulum
  • Mitochondria (correct)
  • Nucleus
  • Golgi apparatus

    • What is the main contribution of diaphragm to the respiratory process?

  • Contraction of alveoli for gas exchange
  • Enlargement of the chest cavity lengthwise (correct)
  • Regulation of air pressure in the lungs
  • Production of mucus for lubrication

    • What is the primary function of intercostal muscles during respiration?

    <p>Helping the inward and outward movement of ribs, enlarging the chest cavity all around</p> Signup and view all the answers

    What is the purpose of pleural fluid in the respiratory system?

    <p>It provides lubrication for free movement of the expanding and contracting lungs</p> Signup and view all the answers

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